Determine the volume of A 5% solution of C3H6O that would contain 20ml of C3H6O

Answer:

Cysteine is an amino acid that contains a thiol group (-SH) in its side chain. It has a central carbon atom that is bonded to an amino group (-NH2), a carboxyl group (-COOH), a hydrogen atom (-H), and a sulfhydryl group (-SH). These four groups are attached to the central carbon atom, which makes cysteine a chiral molecule that exists in two mirror-image forms. In biological systems, cysteine plays an important role in protein structure and function, as well as in various metabolic processes. The sulfhydryl group in cysteine is particularly reactive and can form disulfide bonds with other cysteine residues in proteins, which contribute to protein stability and conformation.

Explanation:

Answer:

Where is question 2..... Kindly send the whole question

Answer:

To convert Calories to kilojoules, we need to multiply the value by 4.184. Therefore:

326.7 Calories * 4.184 kJ/Calorie = 1367.3 kJ

So one mole of ethanol releases 1367.3 kJ of energy during combustion.

Answer:

Smaller.

Explanation:

A cation has a smaller radius than its neutral atom because it loses valence electrons. The “new” valence shell is held closer to the nucleus, resulting in a smaller radius for the cation. An anion has a larger radius than the neutral atom because it gains valence electrons.

When atoms ionize to form cations, they generally become smaller.

An atom loses one or more electrons from its outermost energy level, known as the valence shell, to form a positively charged ion (cation). The loss of electrons results in a decrease in the overall size of the electron cloud surrounding the nucleus, causing the cation to be smaller than the neutral atom.

As the number of protons in the nucleus remains unchanged, the positive charge on the nucleus now attracts the remaining electrons more strongly, causing them to move closer to the nucleus. This effect is known as increased effective nuclear charge. Consequently, the remaining electron cloud contracts, further reducing the size of the ion.

In summary, when atoms ionize to form cations, they lose electrons from their valence shells, leading to a contracted electron cloud and increased effective nuclear charge. These factors contribute to the smaller size of cations compared to their neutral counterparts.

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The mole fraction of NH₃ in the solution is 0.076. The mole fraction is a way of expressing the concentration of a component in a solution. It is defined as the number of moles of a particular component divided by the total number of moles in the solution.

To determine the mole fraction of  NH₃ in the solution, we need to first calculate the total mass of the solution.

Total mass of solution = mass of  NH₃ + mass of water
Total mass of solution = 15.0g + 250g
Total mass of solution = 265.0g

Next, we can use the density of the solution to calculate its volume:

Density = mass/volume
0.974 g/ml = 265.0g/volume
Volume = 272.11 ml

Now we can use the mass of  NH₃ and the total volume of the solution to calculate the mole fraction of  NH₃:
Mole fraction of  NH₃= moles of  NH₃/total moles in solution

To find the moles of  NH₃, we need to first convert the mass of  NH₃ to moles using its molar mass:
Molar mass of  NH₃ = 14.01 g/mol
Moles of  NH₃= 15.0g / 14.01 g/mol
Moles of  NH₃= 1.07 mol

To find the total moles in the solution, we need to use the density and the molar volume of water (which is 18.02 mL/mol at room temperature and pressure):

Volume of water = total volume - volume of  NH₃
Volume of water = 272.11 ml - (15.0g / 1.00 g/ml)
Volume of water = 257.11 ml
Total moles in solution = (257.11 ml / 1000 ml/L) * (1 L/1000 ml) * (1 mol/18.02 L)
Total moles in solution = 0.014 mol

Now we can calculate the mole fraction of  NH₃:

Mole fraction of  NH₃= 1.07 mol / 0.014 mol
Mole fraction of  NH₃= 0.076

Therefore, the mole fraction of  NH₃in the solution is 0.076.

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The statements that are concerning gas pressure is/are correct :

1) Gas pressure arises from collisions of gas molecules with the walls of the container holding the gas.
2) Increasing the number of gas molecules within a container increases the number of collisions with the walls of the container, thereby increasing the gas pressure.
3) As the temperature of a gas increases, gas molecules exert more force on the walls of their container.

Your answer: All three statements are correct.

Explanation:
1) Gas pressure is a result of gas molecules colliding with the walls of their container, transferring their momentum and creating force.
2) When you increase the number of gas molecules in a container, the number of collisions with the walls also increases, which in turn increases the gas pressure.
3) As the temperature of a gas increases, the kinetic energy of the gas molecules increases, leading to more forceful collisions with the walls of the container and a higher gas pressure.

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The field of chemistry called Kinetics explains why bromine trifluoride reacts one way and water vapor reacts another during a reaction.

What is Energy?

Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.

The field of chemistry that explains why bromine trifluoride reacts violently with water vapor while water vapor reacts differently is called reaction thermodynamics. Reaction thermodynamics is concerned with the energy changes that occur during chemical reactions, including the free energy change (ΔG), enthalpy change (ΔH), and entropy change (ΔS).

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Answer: The answer is reactants

Explanation:

In naming organic compounds, if there is a tie between assigning priority to a double bond or triple bond, the double bond takes precedence. To explain further, when naming organic compounds using the IUPAC nomenclature, you should follow these steps:

1. Identify the parent hydrocarbon chain, which is the longest continuous carbon chain.
2. Number the carbon atoms in the parent chain starting from the end closest to the functional group, double bond, or triple bond.
3. When there is a tie between assigning priority to a double bond or triple bond, the double bond is given priority, meaning it should receive the lowest possible number.
4. Write the name of the compound, including any substituents, the location of the double and/or triple bonds, and the parent hydrocarbon name.

Remember, if there is a tie between assigning priority to a double bond or triple bond in naming organic compounds, the double bond takes precedence.

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Answer:

Explanation:

A precipitation reaction occurs upon the mixing of two solutions of ionic compounds when the ions present together in the mixture can form an insoluble compound. In such cases, the solution turns visibly cloudy, a phenomenon known as precipitation.

The first three quantum numbers describe the energy level, subshell, and orbital a particular electron is in, whereas the fourth quantum number describes the spin of the electron.

Quantum numbers are essential for understanding the behavior and arrangement of electrons in an atom.

The first quantum number, denoted as n, is the principal quantum number, which corresponds to the energy level of an electron and its distance from the nucleus. The second quantum number, represented by l, is the angular momentum quantum number, indicating the shape of the orbital. It also determines the subshell (s, p, d, f) in which the electron resides. The third quantum number, designated as m_l, is the magnetic quantum number, specifying the orientation of the orbital in space.

The fourth quantum number, represented by m_s, is the spin quantum number, which describes the intrinsic angular momentum, or spin, of the electron. Electrons can have one of two possible spin values: +1/2 or -1/2, often referred to as "spin-up" and "spin-down" states. This property is essential for understanding the behavior of electrons within an orbital, as the Pauli Exclusion Principle states that no two electrons in an atom can have the same set of quantum numbers. This means that within a single orbital, two electrons must have opposite spins.

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the value of Kb for ClO⁻ at 25 degrees Celsius is 2.5 × 10⁻⁷.

To find the value of Kb for Clo- at 25°C, we need to use the relationship between Ka and Kb for the conjugate acid-base pair.

Ka x Kb = Kw

Where Kw is the ionization constant of water (1.0 x 10^-14 at 25°C).

Note: It's important to specify the unit of temperature in this case. The standard unit for temperature in chemistry is degrees Celsius (°C).
Hi! To find the value of Kb for ClO⁻ at 25 degrees Celsius, given the Ka for HClO is 4.0 × 10⁻⁸ at 25 degrees Celsius, follow these steps:

1. Write down the ion product constant for water (Kw) at 25 degrees Celsius:
Kw = 1.0 × 10⁻¹⁴

2. Use the relationship between Ka, Kb, and Kw:
Ka × Kb = Kw

3. Solve for Kb using the given Ka value:
Kb = Kw / Ka = (1.0 × 10⁻¹⁴) / (4.0 × 10⁻⁸)

4. Calculate Kb:
Kb = 2.5 × 10⁻⁷

So, the value of Kb for ClO⁻ at 25 degrees Celsius is 2.5 × 10⁻⁷.

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The equilibrium constant (K) for the reaction is 2.22 when their is a mixture of nitrogen, hydrogen, and ammonia contained in a 1.0 L flask.

What is equilibrium constant ?

The equilibrium constant (K) is a value that describes the extent of a chemical reaction at equilibrium. It is defined as the ratio of the product concentrations (raised to their stoichiometric coefficients) to the reactant concentrations (also raised to their stoichiometric coefficients), each concentration raised to a power equal to its stoichiometric coefficient in the balanced chemical equation. The equilibrium constant is temperature-dependent and is a characteristic property of a given reaction.

The balanced chemical equation for the reaction is:

[tex]N_2[/tex](g) + [tex]3H_2[/tex](g) ↔ [tex]2NH_3[/tex](g)

The equilibrium constant expression for the reaction is:

[tex]K_c = [NH_3]^2 / ([N_2][H_2]^3)[/tex]

Substituting the equilibrium concentrations into the expression gives:

[tex]K_c = (0.10 mol/L)^2 / ((0.25 mol/L)(0.15 mol/L)^3) = 2.22[/tex]

Therefore, the equilibrium constant (K) for the reaction is 2.22.

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The element that would be expected to have chemical and physical properties closest to those of fluorine is D) Cl, or chlorine.

Fluorine and chlorine are both in the halogen group, which means they have similar electron configurations and reactivity patterns. They both have seven valence electrons, making them highly reactive and likely to form compounds with other elements.

Chlorine also has a similar electronegativity to fluorine, meaning it has a strong attraction for electrons and tends to form polar bonds with other elements. In terms of physical properties, both fluorine and chlorine are gases at room temperature and have similar boiling points and densities.

While sulfur (A) is also in the same period as chlorine and fluorine, it is not in the same group and therefore has different chemical properties. Iron (B) and neon (C) are in completely different groups and would not be expected to have similar properties to fluorine. Overall, the best choice for an element with properties closest to those of fluorine is chlorine.

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Answer:

0.0401 (3 s.f.)

Explanation:

Assuming that the gas is a perfect gas and obeys the ideal gas law,

pV = nRT.

In the above gas law, p stands for pressure, V stands for volume, n stands for the number of moles and T stands for pressure. I will use the R (universal gas constant) value of 0.08206 L·atm/K·mol in the working below.

At Standard Temperature and Pressure (STP), the pressure is at 1 atm and the temperature is at 273.15 K.

pV = nRT

Substitute p= 1 atm, V= 0.5 L, T= 273.15,

1(0.5)= n(0.08206)(273.15)

Solve for n:

n= 44.829378

Number of moles× mw= mass

∴ mw= mass ÷ number of moles

Given that the mass is 1.80 g,

Molar mass of gas

= 1.80 ÷44.829378

= 0.0401 (3 s.f.)

The reactions that will take place spontaneously are:

To determine which reaction will take place spontaneously, we need to compare the standard reduction potentials (E°) of the half-reactions involved in each reaction. According to reference table adv-10, the half-reactions and their standard reduction potentials are:

Ni²⁺ + 2e⁻ → Ni(s) E° = -0.26 V

Pb²⁺ + 2e⁻ → Pb(s) E° = -0.13 V

Au³⁺ + 3e⁻ → Au(s) E° = +1.50 V

Al³⁺ + 3e⁻ → Al(s) E° = -1.66 V

Sr²⁺ + 2e⁻ → Sr(s) E° = -2.90 V

Sn²⁺ + 2e⁻ → Sn(s) E° = -0.14 V

Fe²⁺ + 2e⁻ → Fe(s) E° = -0.44 V

Cu²⁺ + 2e⁻ → Cu(s) E° = +0.34 V

Based on these standard reduction potentials, we can see that reactions 2 and 4 will take place spontaneously because they have a positive E° value (the higher the value, the greater the tendency for the reaction to occur). Reactions 1 and 3 will not occur spontaneously because they have a negative E° value. Therefore, the answer is reactions 2 and 4.

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The molar mass of the atom with a face-centered cubic unit structure is approximately 207.6 g/mol.

To determine the molar mass of an atom with a face-centered cubic (FCC) unit structure, we need to first find the number of atoms in the unit cell and then convert the mass of the unit cell into molar mass.

In a face-centered cubic unit cell, there are 4 atoms per unit cell.

This is because each of the 8 corner atoms contributes 1/8 of an atom, and each of the 6 face-centered atoms contributes 1/2 of an atom:

(8 corner atoms × 1/8) + (6 face-centered atoms × 1/2) = 4 atoms

Next, we can use the given mass of the unit cell to calculate the mass of one atom:

(1.38 × 10⁻²¹ g) / 4 atoms = 3.45 × 10⁻²² g/atom

Now, to determine the molar mass, we will use Avogadro's number (6.022 × 10²³ atoms/mol):

(3.45 × 10⁻²² g/atom) × (6.022 × 10²³ atoms/mol) = 207.6 g/mol

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Amino acids are amphoteric, meaning that they can act as both acids and bases.

The building blocks of proteins are amino acids, which are the chemical compounds that come together to make proteins. These biomolecules are essential for human growth and development and are engaged in a number of biological and chemical processes in the body. In nature, there are around 300 amino acids.

Amino acids are amphoteric, meaning that they can act as both acids and bases. They have both an acidic carboxyl group (-COOH) and a basic amino group (-NH₂) in their structure. In a low pH environment, the amino acid will donate a proton from the amino group, becoming positively charged. In a high pH environment, the carboxyl group will lose a proton, becoming negatively charged. At a certain pH, called the isoelectric point, the amino acid will have no net charge because the acidic and basic groups will be equally protonated and deprotonated.

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Answer:

(D) 3.47.

Explanation:

To solve this problem, we need to use the following equation for the dissociation of formic acid (HCHO2):

HCHO2 + H2O ↔ H3O+ + CHO2-

The Ka expression for this reaction is:

Ka = [H3O+][CHO2-]/[HCHO2]

We can assume that the initial concentration of HCHO2 and CHO2- are equal to their molarities, and that they will both react until equilibrium is reached. Therefore, we can use an ICE table to determine the concentrations of each species at equilibrium:

markdown

Copy code

     HCHO2    +    H2O   ↔   H3O+   +   CHO2-

I 0.15 M 0 M 0 M 0 M

C -x -x +x +x

E 0.15-x 0-x x x

Substituting these concentrations into the Ka expression, we get:

1.8 × 10^-4 = (x)(x)/(0.15 - x)

Simplifying this equation, we get a quadratic:

x^2 + 1.2 × 10^-3 x - 2.7 × 10^-5 = 0

Solving for x using the quadratic formula, we get:

x = 0.0108 M

Therefore, [H3O+] = 0.0108 M, and the pH of the solution is:

pH = -log[H3O+]

pH = -log(0.0108)

pH = 2.97

Rounding this to two decimal places gives us the answer of (D) 3.47.

If we have 800 g of oxygen gas reacting with 1 mole of octane, the mass of water produced would be 162 g.

To determine the mass of water produced by the reaction of octane and oxygen gas, we need to use the balanced chemical equation for the reaction. The balanced chemical equation for the combustion of octane is:
C8H18 + 25O2 → 8CO2 + 9H2O

From the equation, we can see that for every 25 moles of oxygen gas (O2) that reacts, 9 moles of water (H2O) are produced. To determine the mass of water produced, we need to know the amount of oxygen gas that reacts.

Assuming we have 1 mole of octane, we would need 25 moles of oxygen gas to react completely. The molar mass of O2 is 32 g/mol, so 25 moles of O2 would have a mass of:

25 moles O2 x 32 g/mol = 800 g O2

Using the mole ratio from the balanced chemical equation, we can calculate the mass of water produced:

9 moles H2O x 18 g/mol = 162 g H2O

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The two steps in an SN1 reaction are: (1) Formation of the carbocation intermediate (2)Nucleophilic attack                                  
The rate-limiting step in an SN1 reaction is the first step.                      

1. Formation of the carbocation intermediate: In this step, the leaving group departs from the substrate molecule, creating a positively charged carbocation intermediate.

2. Nucleophilic attack: In this step, a nucleophile attacks the carbocation intermediate, forming a new bond and leading to the formation of the final product.

The rate-limiting step in an SN1 reaction is the first step, which is the formation of the carbocation intermediate. This step is slower than the nucleophilic attack and determines the overall rate of the reaction.

Substitution nucleophilic unimolecular is referred to as SN1. The rate-determining step of the SN1 process, a nucleophilic substitution reaction, is unimolecular.

An illustration of an SN1 reaction is the hydrolysis of tert-butyl bromide in an aqueous NaOH solution.

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Answer:

When the term "break down" is used in reference to substances, it typically means to chemically decompose or separate a compound into its individual elements or molecules. In the case of Mercury and Sodium chloride, the number of different substances that can be recovered from the breakdown would depend on the method of breaking down or separation used.

Mercury is a chemical element with the atomic number 80, and it is typically found as a liquid at standard conditions for temperature and pressure. Mercury can be broken down into its individual atoms through a process called electrolysis, which uses an electrical current to split the mercury atoms into their component elements. Therefore, if mercury were broken down through electrolysis, the only substance that could be recovered would be individual mercury atoms.

Sodium chloride, on the other hand, is an ionic compound consisting of sodium cations (Na+) and chloride anions (Cl-). It is commonly known as table salt and is a crystalline solid at room temperature. Sodium chloride can be broken down into its individual ions through a process called electrolysis, similar to the breakdown of mercury. Therefore, if sodium chloride were broken down through electrolysis, two different substances could be recovered: sodium ions and chloride ions.

In addition, sodium chloride can also be broken down into its individual elements using a more traditional chemical reaction known as a decomposition reaction. This involves heating sodium chloride to high temperatures to break the ionic bond between sodium and chlorine. In this case, two different substances could also be recovered: metallic sodium and chlorine gas.

In summary, the number of different substances that could be recovered from the breakdown of Mercury and Sodium chloride would depend on the method of breaking down or separation used. In the case of electrolysis, only individual atoms or ions could be recovered, while in the case of decomposition or heating, unique elements or gases could be retrieved.

Answer:

12,552 j of heat released

Explanation:

This is the final answer

Based upon the protocol, the reasonable void volume of the sephadex g-100 column is the molecules with the diameter larger as the pore size.

The void volume  is the volume of the mobile phase that is required to the elute the molecule which has the zero retention in the stationary phase. For the ideal case, this is equal to the volume of the mobile phase in the column, this is the volume for pores and the spaces in between the stationary phase.

The void volume is the interstitial liquid. The void volume of the sephadex is the molecules with the diameter that is the larger as compared to the  pore size and it is excluded from gel and the elution volume and this is equal to the void volume of the column.

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The mole fraction of hydrogen in the mixture is 0.333 or approximately 0.33.

To find the mole fraction of hydrogen in the mixture, we first need to determine the number of moles of each gas in the separate vessels. For N2 in the 4.0 L vessel at STP, we can use the ideal gas law:

PV = nRT

where P is pressure, V is volume, n is the number of moles, R is the gas constant, and T is temperature. At STP, the pressure is 1 atm and the temperature is 273 K.

Rearranging the equation, we get:

n = PV/RT = (1 atm x 4.0 L)/(0.0821 L atm/mol K x 273 K) = 0.163 mol

Similarly, for H2 in the 2.0 L vessel at STP, we get:

n = PV/RT = (1 atm x 2.0 L)/(0.0821 L atm/mol K x 273 K) = 0.0815 mol

When the valve is opened and the gases mix, the total volume of the mixture is 6.0 L. The mole fraction of hydrogen in the mixture is the number of moles of hydrogen divided by the total number of moles:

X(H2) = 0.0815 mol / (0.163 mol + 0.0815 mol) = 0.333

As a result, the mole fraction of hydrogen in the combination is 0.333, or around 0.33.

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The pH of a solution that is 0.111 M in sodium formate (NaHCO2) and formic acid (HCO2H), with a Ka of formic acid of 1.77 × 10^-4, can be calculated using the following these steps:

1. Recognize that this is a buffer solution, as it contains both a weak acid (formic acid) and its conjugate base (sodium formate).

2. Use the Henderson-Hasselbalch equation for buffer solutions: pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base (sodium formate) and [HA] is the concentration of the weak acid (formic acid).

3. Calculate the pKa: pKa = -log(Ka) = -log(1.77 × 10^-4) ≈ 3.75

4. Substitute the values into the Henderson-Hasselbalch equation: pH = 3.75 + log(0.111/0.111)

5. Simplify: pH = 3.75 + log(1) = 3.75 + 0 = 3.75

The pH of the solution is approximately 3.75, which is not one of the given options. However, considering the given options, the closest answer is A) 3.387.

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The substance that will have the greatest solubility at 90 degrees is substance C

Temperature has a big impact on how soluble gases are in liquids. In general, the solubility of gases in liquids decreases as temperature increases.

This is done so that when the temperature rises and the gas molecules' kinetic energy increases, they can move more quickly and more easily exit from the liquid. It is more challenging for a gas to dissolve in a liquid at higher temperatures because the molecules of a gas and a liquid have less attraction to one another.

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In a cation of Beryllium with a +1 charge, there Protons=4, Neutrons=4, Electrons=3, hence, option B is correct.

When Beryllium loses one electron to form a cation with a +1 charge, it becomes Be+1. The number of neutrons remains the same as in the neutral atom, which is 4. Option B is the right answer since protons equal 4, neutrons equal 4, and electrons equal 3.

The electron configuration of an ion, such as the +1 charge Beryllium cation, determines its characteristics, which impact its reactivity and chemical behavior.

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HCl and MGBr₂ are electrolytes, while Sucrose and CH₄ are nonelectrolytes.

Electrolytes are substances that dissociate into ions in water, whereas nonelectrolytes do not dissociate into ions.

HCl (hydrogen chloride) is a strong acid and dissociates completely into H+ and Cl- ions in water, making it an electrolyte.

MGBr₂ (magnesium bromide) is an ionic compound that dissociates into Mg₂+ and 2Br- ions in water, making it an electrolyte.

Sucrose is a molecular compound that does not dissociate into ions in water and, therefore, is a nonelectrolyte.

CH₄ (methane) is also a molecular compound that does not dissociate into ions in water and, therefore, is a nonelectrolyte.

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The elements listed in order of decreasing atomic size, starting with the largest at the top are:

Ge > Si > Sc > Rb > S > Ne



Atomic size refers to the distance between the nucleus and the outermost shell of electrons in an atom. It generally decreases across a period (row) in the periodic table from left to right, and increases down a group (column).

In the given list of elements, germanium (Ge) has the largest atomic size because it has the most number of shells among the listed elements. Silicon (Si) has the second largest atomic size due to its same electron configuration as Ge. Scandium (Sc) has a larger atomic size than Rb and S because it has more shells than both of them. Rb (rubidium) has a larger atomic size than S (sulfur) because Rb is located below S in the periodic table and therefore has more shells. Finally, Neon (Ne) has the smallest atomic size among the listed elements because it has only two shells.
The elements in order of decreasing atomic size, starting with the largest at the top are: Rb, Sc, Ge, Si, S, and Ne.

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