A student performs four trials of an investigation to determine the boiling point of water. How should the student handle the results? (1 point)
O The student should use the value that is closest to 100°C.
O The student should take the average of the results from all four trials.
O The student should use the maximum value of the results.
O The student should take the average of the minimum and maximum value of the results.

To calculate the value for the molecular weight of your unknown been affected if a small quantity of the unknown stuck to the metal stirring rod and failed to dissolve in the benzophenone following is the process:

Your mass of counted solute added to the detergent would be lower than the recorded value performing in a lower temperature change grounded on mass of solute. A lower temperature change will affect in a lower number of calculated intelligencers of solute present. This will give a advanced molar mass for your unknown compared to the real molar mass( lower number of intelligencers divided into the mass of solute gives a larger molar mass).

These two scenarios are predicated on a solute-solvent mixture's lower freezing-point (or melting-point) as compared to pure solvent. A nonelectrolyte solute's equation is:

ΔTf = Kfm

Kf is the solvent's specific molal freezing-point depression constant, and m is the molality of the solution mixture.

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The molality of HCl in the solution is[tex]0.00122 mol/kg[/tex]

Molality is defined as the number of moles of a solute in one kilogram of a solvent. In this case, the solvent is water.

To calculate the molality, we first need to calculate the molarity of the solution. Molarity is defined as the number of moles of a solute in one liter of solution.

To calculate the molarity, we need to know the mass of the solute (HCl) and the volume of the solution. The mass of the solute can be calculated using the density of the solution (1.22 g/ml):

Mass of HCl =[tex]Density * Volume[/tex]

Volume = [tex]\frac{Mass}{Density }[/tex]

Volume =[tex]\frac{(12.0 mol/L) }{ (1.22 g/ml) }= 9.839 L[/tex]

Molarity = [tex]\frac{ (12.0 mol/L) }{(9.839 L) }= 1.22 mol/L[/tex]

Now, we can calculate the molality:

Molality = [tex]\frac{ (1.22 mol/L) }{(1000 g/kg) }= 0.00122 mol/kg[/tex]

Therefore, the molality of HCl in the solution is [tex]0.00122 mol/kg[/tex].

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Answer: 20.16cm³ of CO₂ produced

Explanation: the equation for the reaction between carbon monoxide (CO) and oxygen (O2) is:

2CO (g) + O₂ (g) → 2CO₂ (g)

Given that 20 cm³ of carbon monoxide is reacted with 10 cm³ of oxygen. From the equation,

we can see that two molecules of CO react with one molecule of O₂to produce two molecules of CO₂

Since we have 20 cm³ of CO and 10 cm³ of O₂, we can calculate the number of moles of CO and O₂ as follows:

CO: 20 cm³ x (1 mole / 22.4 cm³) = 0.89 moles

O₂: 10 cm³ x (1 mole / 22.4 cm³) = 0.45 moles

Since two molecules of CO react with one molecule of O₂, the number of moles of O₂ is half the number of moles of CO. Since we have 0.45 moles of O₂, we can calculate the number of moles of CO₂ produced as follows:

0.45 moles x 2 = 0.9 moles

Finally, to find the volume of CO₂ produced, we can multiply the number of moles of CO₂ by the volume occupied by one mole of CO₂:

0.9 moles x 22.4 cm³/mole = 20.16 cm³

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There is a direct relationship between temperature, speed, and kinetic energy of gas molecules is as the temperature increases, so does the average speed and kinetic energy of the gas molecules.

The temperature, speed, and kinetic energy of gas molecules are related to each other through the gas laws and the concept of ideal gases. According to the ideal gas law, the pressure, volume, and temperature of a gas are proportional to each other, and are directly proportional to the average kinetic energy of the gas molecules. This means that as the temperature of a gas increases, the average kinetic energy of its molecules also increases.

The relationship between temperature, speed, and kinetic energy can also be understood through the concept of random motion. Gas molecules are in constant random motion, bouncing off of each other and the walls of their container. The average kinetic energy of these molecules is directly proportional to the temperature of the gas. As the temperature of the gas increases, the average speed of its molecules also increases, and thus, so does their kinetic energy.

In mathematical terms, the average kinetic energy of a gas molecule can be represented as:

KE = (3/2)kT

where KE is the average kinetic energy, k is the Boltzmann constant, and T is the temperature in Kelvin.

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The  letter represent the transition from solid to liquid E. E.

Transition is a process of change from one state or condition to another. It is a fundamental element of life, as it allows us to move forward, adapt, and develop. Transition can be physical, emotional, spiritual, or even intellectual. It can involve a change in environment, relationships, beliefs, roles, or responsibilities. Transition can be gradual, or it can happen suddenly. It can be difficult and require a lot of effort, or it can be relatively easy. Transition can be a positive experience, or it can be a difficult experience. Regardless of the form it takes, transition is a necessary part of life and growth.

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Carbon is special because it is the basis of all known life on Earth. It is the key element in organic compounds, which are the building blocks of life.

Carbon has the ability to form a vast number of chemical compounds, more than any other element, with almost ten million compounds described to date. This is due to its unique ability to form strong bonds with other elements, including other carbon atoms. This property allows carbon to form long chains and rings, which are the basis of many organic compounds.

Additionally, carbon is a key component of many important biological molecules, such as DNA, proteins, and carbohydrates. In short, carbon is special because it is essential to life as we know it.

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We need 140 mL of 0.656 M HNO3 to dissolve 6.31 g of BaCO3.

To solve this problem, we need to use stoichiometry and the balanced chemical equation for the reaction between nitric acid (HNO3) and barium carbonate (BaCO3).

The balanced equation is:

2HNO3(aq) + BaCO3(s) → Ba(NO3)2(aq) + H2O(l) + CO2(g)

From this equation, we can see that 2 moles of HNO3 react with 1 mole of BaCO3. We can use this information to calculate the number of moles of HNO3 needed to react with 6.31 g of BaCO3.

First, we need to calculate the number of moles of BaCO3:

molar mass of BaCO3 = 137.33 g/mol

moles of BaCO3 = mass / molar mass = 6.31 g / 137.33 g/mol ≈ 0.046 mol

Since 2 moles of HNO3 react with 1 mole of BaCO3, we need 2 x 0.046 = 0.092 moles of HNO3.

Now we can use the molarity of the HNO3 solution to calculate the volume needed:

Molarity = moles of solute / volume of solution (in liters)

0.656 M = 0.092 mol / volume of HNO3 solution (in liters)

Solving for volume of HNO3 solution, we get:

volume of HNO3 solution = 0.092 mol / 0.656 M = 0.140 L = 140 mL

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Answer:

3.4 (2/5) (sorry i dont have a calculator )

Explanation:

3.4 moles of O2 x (2 moles of P2O5/5 moles of O2)

= 3.4 (2/5)

Today was a difficult day. The sun's rays seemed to beat down on us like never before - the heat was unbearable.

What do you mean by the ozone layer?

The ozone layer is a region of Earth’s atmosphere located in the stratosphere, between 10 and 30 km above Earth’s surface. It is composed of ozone molecules, which are made up of three oxygen atoms (O3). The ozone layer acts as a shield, blocking most of the ultraviolet radiation from the sun. This helps protect life on Earth from the harmful effects of UV radiation.

I can only imagine what life would be like without the ozone layer. Without the ozone layer protecting us, we are exposed to the damaging rays of the sun, including UV radiation.

The air quality is also much worse. With the ozone layer gone, there would be a huge increase in the amount of pollution in the air, leading to much more severe health issues for people than we currently experience.

It's also getting harder and harder to grow food. With the depletion of the ozone layer, crops are being destroyed by the intense heat, leaving us with much less food than we used to have.

It's a struggle to get through each day without the ozone layer. I miss the days when I could go outside and be comfortable, rather than feeling like I'm suffocating from the heat.

It's so hard to see the world suffer from the lack of an ozone layer. I can only hope that something is done soon to save us from this reality.

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The order of reaction is 1/2 with respect to that reactant when the concentration of a reactant is doubled.

Rate of reaction =k[A] ⁿ where n is the order of reaction

=>r₁=k[A₁]ⁿ-----(eq1)

=>r₂=k[A₂]ⁿ-------(eq2)

Dividing eq2 with eq1

=>r₂/r₁=[A₂]ⁿ / [A₁]ⁿ

=>2/1 = [4/1]ⁿ

=>4ⁿ=2

=>n=1/2

The order of reaction is characterized as the power reliance of the rate on the centralization of every reactant.

When the rate law of a reaction is resolved a similar regulation can be utilized to totally figure out the creation of the response combination. At the end of the day, the reaction request is the type to which the convergence of the particular species is raised, and it shows to what level the centralization of the species influences the pace of reaction. It likewise demonstrates up to which degree the species makes an extensive difference. For instance, the pace of a first order of reaction is resolved simply by the convergence of one animal types in the reaction.

​

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The mass in grams of hydrogen atoms in a sample of butanol, C4H9OH, containing 3.01 x 10^23 molecules is approximately 5.05 grams

The mass of the hydrogen atoms in one molecule of butanol is 9 atomic mass units * 1 atomic mass unit/atom = 9 atomic mass units.

We have the sample contains 3.01 x 10^23 molecules, then the total mass of the hydrogen atoms in the sample is:

9 atomic mass units/molecule * 3.01 x 10^23 molecules

= 27.09 x 10^23 atomic mass units

We then convert the atomic mass units to grams we have:

27.09 x 10^23 atomic mass units * (1 gram/6.022 x 10^23 atomic mass units) = 4.51 grams approximately 5.05 grams

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Answer:

Matter is made up of particles that are in constant motion and have energy

Explanation:

Answer:

exchange of heat

Explanation:

as metal is at high temprature therefore it will lose heat and will be absorbed by the water

Molar concentration of the FeCl2 solution is calculated as 3.947 M.

Molar concentration of the solution is defined as number of moles of solute per liter of solution.

Given, mass of FeCl2 = 225 g and molar mass of FeCl2 = 126.75 g/mol

So, moles of FeCl2 = mass of FeCl2 / molar mass of FeCl2

= 225 g / 126.75 g/mol

= 1.776 moles

Given, volume of the solution is 450 mL, or 0.45 L,

the molar concentration can be calculated by:

molar concentration = moles of FeCl2 / volume of solution

= 1.776 moles / 0.45 L

= 3.947 M

So the molar concentration of the FeCl2 solution is 3.947 M.

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Answer:

1.777

Explanation:

To determine the number of moles of FeCl2 in the solution, we need to first convert the given mass of FeCl2 to moles using its molar mass.

Number of moles = Mass / Molar mass

Mass of FeCl2 = 225 g

Molar mass of FeCl2 = 126.75 g/mol

Number of moles of FeCl2 = 225 g / 126.75 g/mol = 1.777 moles

Therefore, the solution contains 1.777 moles of FeCl2.

As the reaction occurs at constant temperature, the pressure inside the container remain the same.

Pressure is defined as the force was applied perpendicular to an object's surface per unit area across which that force is dispersed. 445 Gauge pressure indicates the pressure in relation to the surrounding atmosphere.

Pressure is expressed using a variety of units. Some of these stem from a unit of forces exerted by an area unit. the Si derived unit of pressure, this same pascal (Pa), for instance, becomes a newton every square metre (N/m²).

P×V = n×R×T

As the reaction occurs at constant temperature, the pressure inside the container remain the same.

Therefore, as the reaction occurs at constant temperature, the pressure inside the container remain the same.

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The value of the expression 29.615 / 6.09 using the division property will be 4.863.

Algebra is the study of algebraic expressions, while logic is the manipulation of those concepts.

The acronym PEMDAS stands for Parenthesis, Exponent, Multiplication, Division, Addition, and Subtraction. This rule is used to answer the problem correctly and precisely.

The numbers are given below.

29.615 and 6.09

Then the division between the numbers 29.615 and 6.09 will be given by putting a division sign between them. Then we have

⇒ 29.615 / 6.09

⇒ 4.863

The value of the expression 29.615 / 6.09 using the division property will be 4.863.

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The simulation can be modified to demonstrate different isotopes have different half lives by [tex]-\frac{d[A]}{dt} = k[A]^n[/tex]

Partial life is a partial life because it's defined this way. stay lower than that, and the decay will take out lower than partial tittles; stay more, and it'll take out further than half.

The partial life is used as a accessible measure because a sample of isotopes decays exponentially with time. Each snippet has the same chance of decaying in a fixed time interval and this leads to an exponential decay. All tittles bear the same way and continue to decay until all have been changed, whether this takes glories or seconds.

You can just as fluently define a" one- third" life, a" quarter- life". Radioactive isotopes decay exponentially; half- life is just accessible measure that captures the kinetics of the decay.

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Water is absorbed in the intestine through the process of osmosis. Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a semi-permeable membrane.

In the intestine, the semi-permeable membrane is the cell wall of the intestinal epithelium.

As water moves into the intestine, it dilutes the concentration of solutes such as glucose and electrolytes, creating an osmotic gradient. This gradient drives the movement of water into the bloodstream, where it is distributed throughout the body and helps to maintain fluid balance.

In addition to osmosis, active transport mechanisms, such as sodium-glucose cotransporters, also play a role in absorbing water and electrolytes from the intestine. These transporters actively transport solutes and water across the cell membrane and into the bloodstream, further contributing to the regulation of fluid balance in the body.

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From highest to lowest, the following aqueous solutions are: 0.475 m K3PO4 (highest), 0.907 m KBR, 1.67 m CH3OH, 0.530 m NA2SO4, and 0.722 m NH4NO3 (lowest).

The boiling point of a salt solution rises as the boiling point does. A Rhizob provides the majority of eubacterial antibiotics. As can be seen from the concentration figures, methanol has the lowest concentration. Methanol will have the lowest boiling point as a result. The solution of 0.10 M SrCl2 in 300.0 mL contains the most ions as a result. Therefore, 1.0 MNa2SO4 has the maximum boiling point value. The most highly vaporized substance is 1-chloropentane. Because of its boiling point's "propto 1/("branching")," tert-butyl alcohol has the lowest boiling point. Surface area decreases with increasing branching.

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there are approximately 4.069 x [tex]10^{23}[/tex] iron atoms in a hemoglobin molecule.

The number of iron atoms in a hemoglobin molecule can be calculated as follows:

First, determine the mass of iron in a single hemoglobin molecule:

mass of iron = 0.35% * 65,000 g/mol = 227.5 g/mol

Next, convert the mass of iron to the number of iron atoms by dividing by the atomic mass of iron:

1 iron atom = 55.845 g/mol

number of iron atoms = 227.5 g/mol / 55.845 g/mol/atom = 4.069 x [tex]10^{23}[/tex]iron atoms/mol

So there are approximately 4.069 x [tex]10^{23}[/tex] iron atoms in a single hemoglobin molecule.

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The number of moles of 33 g of sodium chloride is 0.564 . The volume of ocean water considered is 1 L. Then the molarity of the solution is 0.564 M.

Molarity of a solution is a common term used to express the concentration of a solution. It is the the ratio of number of moles of the solute to the volume of solution in liters.

Given that 1 liter of ocean water contains 33 g of NaCl.

molar mass of sodium chloride = 58.5 g/mol.

no.of moles in 33 g of NaCl = 58.5 /33  = 0.564 moles.

volume of ocean water = 1 L

molarity = no.of moles of solute/volume of solution in L.

= 0.564 mole/ 1 l = 0.564 M.

Therefore, the molarity of the salt in sea water is 0.564 M.

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We must first determine how many moles of element X there are in the sample in order to solve the problem: The atomic mass of element y is 24.31 amu because [tex]27.22 g / 33.42 g/mol = 0.814 mol of x[/tex].

The mass of an atom in a chemical element is referred to as having a "atomic mass," which is a fundamental notion in chemistry. Atomic mass units (amu), which are based on the mass of a carbon-12 atom, are used to measure it. The average mass of all an element's isotopes, taking into account their abundance, is what is known as the atomic mass of that element. The number of protons and neutrons in an atom's nucleus influences its chemical properties, hence the atomic mass of an element is a crucial characteristic. Analytical chemistry has several practical uses for understanding atomic mass, particularly in mass spectrometry and isotope labelling.

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If 18.1 ml of 0.800 m hcl solution are needed to neutralize 5.00 ml of a household ammonia solution, The molar concentration of the ammonia solution is 2.88 M.

Molar attention is the most effective way of describing a solute attention in a result. Molarity is described as the total number of intelligencers of solute dissolved in per liter of result, i.e., M = spook/ L. All intelligencers measures are applied to determine the volume of intelligencers in the result that's the molar attention.

Chemical equation

                                    HCl +  NH3 ------> NH4Cl

First of calculate the moles of HCl

mole of HCl = Molarity × Vol (L)

mole of HCl = 0.800× 0.018 = 0.014 mole

As the in balance chemical, moles of HCl and NH3 are equal

so

                       moles of NH3= 0.014

                      Molarity of NH3 = moles ÷ V(L) = 0.014/0.005 =  2.88 M

Result:

The molarity of ammonia will be 2.88 M.

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[Ar]4s24p5  is the electron configuration for Br and Y in noble-gas notation on Using  the periodic table.

Bromine (Br) is a chemical element with atomic number 35, which means it has 35 electrons. To determine its electron configuration in noble-gas notation, we first need to locate the nearest noble gas, which is helium (He) with 2 electrons. From there, we can write the electron configuration for Br by adding electrons in the order of increasing energy levels. Starting from the He configuration, we add the electrons for the next energy levels: 2s2, 2p6, 3s2, and 3p6. Finally, we add the remaining 5 electrons in the 4th energy level, giving us the noble-gas notation [Ar]4s24p5 for Br. Yttrium (Y), on the other hand, is a metal element with atomic number 39, which means it has 39 electrons. To determine its noble-gas electron configuration, we need to find the noble gas that comes before it in the periodic table, which is argon (Ar) with 18 electrons. Starting from the Ar configuration, we add electrons for the next energy levels: 4s2 and 3d1. This gives us the noble-gas notation [Kr]5s24d1 for Y. Note that the 5s2 electron configuration in the Kr notation is equivalent to the 4s2 electron configuration in the Ar notation, as they both occupy the same energy level. Overall, the noble-gas notation is a way of representing the electron configuration of an atom using the electron configuration of a noble gas, which is usually the closest gas that has a completely filled inner electron shell. It is a useful shorthand notation that makes it easier to compare and understand the electron configurations of different atoms.

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The value of x in the figure is

An angle is a geometric figure formed by two rays or line segments that share a common endpoint. This common endpoint is called the vertex of the angle, and the two rays or line segments that form the angle are called its sides.

Angles are measured in degrees, and a full circle contains 360 degrees. Angles can be classified based on their measure. A right angle measures exactly 90 degrees, an acute angle measures less than 90 degrees, and an obtuse angle measures more than 90 degrees but less than 180 degrees.

The figure consist of angel which is an acute angle, an acute angle are angles less than 90 hence 55 is the possible value

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According to the stoichiometry of the chemical reaction between HCl and methane 600.32 g  of HCI are produced by the reaction of 64.9 grams of methane.

Stoichiometry is the determination of proportions of elements or compounds in a chemical reaction. The  relations are based on law of conservation of mass and law of combining weights and volumes.

Stoichiometry is used in quantitative analysis for measuring concentrations of substances present in the sample.

In the given chemical  reaction, 16 g methane gives 148 g HCl , thus, 64.9 g of methane will give 64.9×148/16= 600.32 g.

Thus,  600.32 g  of HCI are produced by the reaction of 64.9 grams of methane.

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Answer:

Being young, kittens can also be called “cubs” although the name “kitten” is more commonly used. Most consider cats as kittens if they are still less than one year of age. However, some vets say that a kitten can already be considered a cat when it reaches eight or nine months.

Or could also use:

Specie and stripes

1. A cat and it’s litter can’t be related without the producer which in this case is the mother

2. The stripes shows that the two are related and yeah you can have to cats that have the same stripes but that’s not likely, every-time any two cats with stripes are put together the cats show similarities but that doesn’t tell us that their related. Every cat has similar stripes but there is something that’s always gonna be off with the stripes whether the stripes have the same color or the stripes have the same arrangement on the cat. Like people cats have similar traits but that doesn’t mean there related (ex: two blue eyed people, that’s doesn’t prove that their related in any type of way).

Explanation:

Answer:

Inherited characteristics that show that a cat and kitten are related include physical traits such as fur pattern and color, eye shape, and body type. Another example is behavioral traits such as playfulness and social behavior. These traits are passed down from parent to offspring through genes and provide evidence of a familial relationship.

Explanation:

A buffer solution with a pH of 4 is created by mixing 0.3 m hydrofluoric acid and 0.7 m sodium fluoride in equal parts.

To calculate the number of moles of HF and F-,

moles HF = molarity * volume

               = 0.3 * 1 L = 0.3 moles

moles F- = molarity * volume

              = 0.7 m * 1L = 0.7 moles

by using the ICE table :

              HF(aq) + NaOH(aq) → NaF(aq) + H2O(l)

initial        0.3              0                    0.7

change  -0.08         0.08              + 0.08

Equ      (0.3 - 0.08)                            (0.7+0.08)

∴ [HF] = 0.3 - 0.08 = 0.22 m

∴[F-] = 0.7 + 0.08 = 0.78 m

when we have Ka for HF = 3.5 x 10⁻⁴

∴Pka = - ㏒ Ka

        = - ㏒ (3.5x10⁻⁴)

        = 3.46

by using the PH formula :

PH = Pka + ㏒[F-]/[HF]

by substitution:

∴PH = 3.46 + ㏒( 0.78 / 0.22)

∴PH = 4

first, we have to get moles of HF & F-

moles HF = molarity * volume

               = 0.3 * 1 L = 0.3 moles

moles F- = molarity * volume

              = 0.7 m * 1L = 0.7 moles

by using the ICE table :

              HF(aq) + NaOH(aq) → NaF(aq) + H2O(l)

initial        0.3              0                    0.7

change  -  0.08             0.08                  + 0.08

Equ      (0.3 - 0.08)                            (0.7+0.08)

∴ [HF] = 0.3 - 0.08 = 0.22 m

∴[F-] = 0.7 + 0.08 = 0.78 m

when we have Ka for HF = 3.5 x 10 ⁻⁴

∴Pka = - ㏒ Ka

        = - ㏒ (3.5x10⁻⁴)

        = 3.46

by using the PH formula :

PH = Pka + ㏒[F-]/[HF]

by substitution:

∴PH = 3.46 + ㏒( 0.78 / 0.22)

∴it is the buffer solution PH = 4

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Antimony is an element having atomic number 51 and mass number 121.76 u. It has 51 number of proton and electrons.

Phosphorus is an element having the atomic number 15. It has 15 protons, electrons, and 16 neutrons.

The symbol of magnesium is Mg whereas the symbol of cobalt in Co.

The two subatomic particles present in the nucleus are the proton and neutron. They are collectively called nucleons. The proton has a positive charge, the electron has a negative charge whereas the neutron has no charge.

Protons and neutrons are accordingly called nucleons since they are in the nucleus of the atom. electrons are a type of subatomic speck with a negative charge. Protons are a type of subatomic particle with a positive charge.

Neutrons, further with protons, are subatomic particles found inside the nucleus of every atom. Neutrons have an impartial electric charge (neither negative nor positive) and have rather more mass than positively charged protons.

So we can conclude that Unlike protons and neutrons, which are detected inside the nucleus at the center of the atom, electrons are initiated outside the nucleus.

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Answer:

Chlorine

Explanation:

Because this will remove dirt and stain and it will kill microorganisms that can cause diseases.