Which of the following statements about elements is not true?
A. Elements contain equal numbers of protons and electrons.
B. Elements contain equal numbers of neutrons and electrons.
C. Elements contain protons and neutrons in their nucleus.
D. Elements contain electrons that orbit around the nucleus.
Answers
Answer:
Option A is not true
Explanation:
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According to the statements of your question, the answer is B: elements contain equal numbers of neutrons and electrons.
To find the correct answer, we must evaluate each statement.
A. Elements contain equal numbers of protons and electrons
It is correct. In a neutral atom, the number of protons and electrons is the same. When an atom gain or lose electrons, the number of electrons is bigger (the atoms gain electrons) or lower (the atoms lose electrons) than the number of protons.
B. Elements contain an equal number of neutrons and electrons.
It is false. The nucleus of an atom is composed of neutrons and protons, where the atomic mass is given by:
[tex] A = Z + N [/tex]
Where:
Z: is the number of protons = atomic number
N: is the number of neutrons
The difference between the numbers of neutrons, protons, and electrons is evidenced in the so-called isotopes. These are atoms of the same element that have the same number of protons (and hence the same number of electrons if the atom is neutral) and a different number of neutrons in the nucleus.
An example is the hydrogen element, whose isotopes are protium (¹H), deuterium (²H), and tritium (³H). In all of them, the number of protons and electrons is the same (equal to 1), the number of neutrons is 0, 1, and 2, respectively, and the atomic masses are 1, 2, and 3, respectively.
C. Elements contain protons and neutrons in their nucleus.
It is correct. According to Rutherford's atomic model, the nucleus of an atom is composed of protons and neutrons with electrons moving around the nucleus.
D. Elements contain electrons that orbit around the nucleus.
It is correct. As we said earlier, Rutherford's atomic model states that negatively charged electrons move in circular paths around a positively charged nucleus. Later, Bohr proposed an atomic model based on circular paths with discrete energy values.
You can find more about the atomic model here:
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Related Questions
Cell phones are widely used by people all over the world as a medium of communication. When a person makes a call from a cell phone, the cell phone emits electromagnetic waves that are intercepted by a nearby cell phone tower. The cell phone tower then connects the call to the phone of the person being called.
Which of the following processes enables a cell phone to receive communications from a cell phone tower?
A.
Electromagnetic waves from the tower produce an electric current in the cell phone's internal circuit when intercepted by the phone's antenna.
B.
Electromagnetic waves from the tower are reflected by the cell phone, producing an electromagnetic field that is detected by the internal circuits of the phone.
C.
Electromagnetic waves diffract around the cell phone's antenna, which allows the waves to be detected by the internal circuits of the phone.
D.
Electromagnetic waves from the tower interfere with the radio waves emitted by the cell phone, producing electric currents in the internal circuits of the phone.
Answers
Answer:
A Electromagnetic waves from the tower produce an electric current in the cell phone's internal circuit when intercepted by the phone's antenna.
Explanation:
Its correct I just did it
The correct option is A which is when a cell phone's antenna picks up electromagnetic waves from a tower, the phone's internal circuit becomes electrically charged through which communication is enabled.
How does a cell phone receive communications from a cell phone tower?Radio waves are sent by mobile phones through a base station network, which is a collection of permanent antennas. Since radiofrequency waves are electromagnetic fields rather than ionising radiation like X-rays or gamma rays, they cannot ionise or destroy chemical bonds in living organisms.
A cell tower has several antennas linked to it, usually positioned on a head frame. Even more than 15 antennas per carrier are found on some towers. This figure largely depends on the performance, area of coverage, and capacity needs of the antenna.
Effect of 5G on health: There are growing worries that the higher intensity radiation from 5G could harm those living close to cell towers. According to theories, the harm done to human DNA by this rise in radiofrequency radiation will result in cancer, premature ageing, and disturbance of cell metabolism.
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How much space do 2x10 22 copper pennies take up
Answers
Answer:
40+22=
Explanation:
62
Can you help me with my Science assignment.Please
Answers
Answer:
my answer is measuring cylinder
What does the periodic table display
Answers
Answer:
chemical elements
Explanation:
I think
Answer:
all of the known elements that exist in the world today.
Explanation:
The Periodic Table
The image above shows a wave
Answers
Answer:
I need an image to help you as best as I can. Hopefully, this gets your attention so I can try to help!
Explanation:
How is the ice different from the water vapor that forms after the water begins to boil?
Answers
Answer:
they are different forms of matter
Explanation:
Why is it important to evaluate a lab experience?
Answers
Answer:
Laboratory experiences may enhance student understanding of specific scientific facts and concepts and of the way in which these facts and concepts are organized in the scientific disciplines. ... Laboratory experiences may promote a student's ability to identify questions and concepts that guide scientific.
The overall lab experience of a student , researcher, a scientist or a faculty have to evaluated in order to improve our activities and to gain knowledge in laboratory safety policies and measurements.
What are good laboratory practises?In a laboratory, there are many more chemicals, equipments and instruments and they all have to be well placed based on their chemical and physical prosperities.
The solubility, reaction with air and water, corrosive nature and other storing conditions have to strictly followed for all chemical in a lab. Similarly all the equipments have to be cleaned well and instruments to calibrated.
Frequent checking of these storage chemicals and instruments helps to reduce any errors. Similarly we have to study other safety measurements that should be taken if any lab accidents are occured.
Thus analysing our experience in lab helps us to provide an idea that where we have to improve and concentrate more when working in lab.
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NH4CL + CaO -> NH3 + H2O + CaCl2
Balance the equation for the overall reaction using the smallest whole-number coefficients.
__NH4CL
__CaO
__NH3
__H2O
__CaCl2
Answers
2, 1, 2, 1, 1 (coefficients)
Whats faster light or sound? PLEASE HELPY ME
Answers
Answer:
The answer is that light is faster than sound.
Explanation:
A good example is of lightning and thunder during a thunderstorm.
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define equivalent weight of an element
Answers
Why is it important to classify living organisms? The DNA of organisms may be more easily analyzed. Organisms may survive longer if they are classified. Scientists may study and discuss organisms more easily. Classifying is needed before scientists may make observations.
Answers
Answer:
All living things are organized into groups by scientists as they are identified. Living things organized into particular groups have common characteristics. Overall, the reason scientists classify living things is to understand the relationships between different organisms
Explanation: Naruto
Answer:
C
Explanation:
look at the attachment
Name the following Compound: CrF2
Answers
Chromium(II) fluoride is the name given to the substance CrF2. In this compound, fluorine (F) is present as fluoride anion while chromium (Cr) is present in +2 oxidation state.
The compound contains two fluoride ions, as indicated by the number prefix "di-" before the element symbol F. An inorganic substance called chromium(II) fluoride crystallizes into a solid. It has a crystal structure that mirrors its atomic arrangement and is composed of fluoride anions and chromium cations. Chromium(II) fluoride is useful in many different industries. It serves as a catalyst in some chemical reactions and as a precursor in the manufacture of other chromium compounds.
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Help? Ill give brainliest if its right :,)
Answers
Answer:
17. 10 atoms
18. 21 atoms
Explanation:
17. 2 Phosphurus and 8 Oxygen
18. 6 Sodium, 3 Sulfur, and 12 Oxygen
Which has the greater mass, 1 liter of water or I liter of gasoline? The density of water is 1.00 g/mL and that of gasoline is approximately 0.68 g/mL.
Answers
Answer:
Water
Explanation:
Gas= 0.689/ml x 1000 ml = 680 g
Water= 1/ml x 1000 ml = 1000 g (grater)
1 liter of water would have greater mass than the I liter of gasoline if the density of water is 1.00 grams/milliliters and that of gasoline is approximately 0.68 grams/milliliters.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
By using the above formula for density
ρ = mass / volume
As given in the problem we have to find which has the greater mass, 1 liter of water or I liter of gasoline if The density of water is 1.00 g/mL and that of gasoline is approximately 0.68 g/mL
1 Litre = 1000 milliliter
1 liter of water = 1000 milliliter
mass of 1 liter of water = density of water ×volume of water
= 1.00 grams/milliliters×1000 milliliter
=1000 grams
Similarly;y for the gasoline ,
1 liter of gasoline = 1000 milliliter
mass of 1 liter of gasoline = density of gasoline ×volume of gasoline
= 0.68 grams/milliliters×1000 milliliter
=680 grams
Thus we calculated that 1 liter of water would have a mass of 1000 grams while the I liter of gasoline has mass of 680 grams.
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can someone please help me i don't know these question bc my family celebrates thanksgiving differently. plz and thank you :3
Easy: How many turkeys are consumed on Thanksgiving day in America?
Medium: How long did the first Thanksgiving Celebration last?
Hard: When was the first NFL football game on Thanksgiving?
Fun: Who was the first president to pardon a turkey?
Answers
Answer:
Easy 46 million turkeys
Medium three days
Hard: 1934
Fun: The first President on record issuing a "pardon" to his turkey was Ronald Reagan.
Explanation:
hop tis helped
The electrons in the outermost energy level are responsible for the atoms _____. These electrons are called the _______ electrons. There can never be more than _____ of these electrons.
Answers
How could a synthetic material such as Acegram affect society?
Answers
Explanation:
Synthetic fiber or synthetic fibre (in British English; see spelling differences) are fibers made by humans through chemical synthesis, as opposed to natural fibers that are directly derived from living organisms. They are the result of extensive research by scientists to improve upon naturally occurring animal and plant fibers. In general, synthetic fibers are created by extruding fiber-forming materials through spinnerets, forming a fiber. These are called synthetic or artificial fibers. Synthetic fibers are created by a process known as polymerization, which involves combining monomers to make a long chain or polymer. The word polymer comes from a Greek prefix "poly" which means "many" and suffix "mer" which means "single units". (Note: each single unit of a polymer is called a monomer). There are two types of polymerization: linear polymerization and cross-linked polymerization.
Synthetic material are madeup of monomers and long chain of monomers are known as polymers. The process is known as polymerization and the synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
What is synthetic material?Synthetic materials are microplastic pollution and madeup up of polymers which is a long chain of polymers and the process is known as polymerization.
The synthetic materials are often converts into microplastic that takes a long period of time to decompose and they are also responsible for generation of greenhouse gases.The synthetic material which is popularly known is nylon which is very tough to recycle.
Therefore,synthetic material are turned as microplastic which takes a long period of time to decompose. By this way the synthetic materials are very harmful for the society.
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A student mixes 250 millimeters of a strong base with 100 millimeters of a strong acid. What will the result be?
- a weak base
— weak acid
- a stronger base
- a stronger acid
Answers
Answer:
A stronger base.
Explanation:
In neutralization reactions, when an acid is mixed with a base, both species react to different degrees that depends on the concentrations and volumes of the acid and the base. In this case the student mixes a strong base (250 mL) with a strong acid (100 mL), what will happen is that the substance that is going to predominate (strong base) will be the one that is in greater quantity than the other, so the solution will remain a strong base.
What is the difference between a rock and a mineral?
Minerals contain fossils while rocks do not.
A mineral is an inconsistent mixture of rocks, while a rock is "pure" and made up
of a precise combination of minerals.
O A rock is harder than all minerals.
A rock is an inconsistent mixture of minerals, while mineral is "pure" and made
up of a precise combination of chemicals.
PLEASEEE HELPPP
Answers
Answer:
A rock is an inconsistent mixture of minerals, while mineral is "pure" and made up of a precise combination of chemicals.
Explanation:
astronauts in space would not be able to hear a landslide on the moon because
Answers
Answer:
there is no sound is space or because there in no gravity
Explanation:
Answer:
there are a couple reasons
they would be able to hear outside there suits i believe also gravity is light on the moon so rocks would likely fall softly where they would notice also landslide would be very rare on the moon due to the material the moon i s made of which would moves do to impact and there are a lot of reasons that anyone could make up
Explanation:
but the scientific answer is : sound waves needs a medium to travel just like our planet, we are able to hear each other because the air around us acts as the medium which sound waves travel, however, the moon does not have any air that sound waves,which a landslide would produce, use to travel from one place to another.
I need help 7th grade science
Answers
Answer:
a flowing stream
Explanation:
.........
A hiker climbs a hill. How does the potential energy of the hiker change as she climbs higher?
A
Her potential energy decreases because her height above the ground increases.
B
Her potential energy decreases because her speed increases.
C
Her potential energy increases because her height above the ground increases.
D
Her potential energy increases because her speed increases.
Answers
which law of motion does the diagram depict
Answers
Can somebody plz tell me which one I should circle for each question thanks!!!
(All must be correct)
WILL MARK BRAINLIEST
Grade7science
Answers
Answer:
1. False
2. True
3. True
4. True
5. False
Explanation:
Answer:
1. False (All compounds are molecules but not all molecules are compounds)
2. True (elements make up a compound by combining chemically together)
3. True (water is a molecule consisting of 3 atoms and 2 hydrogen that bond together)
4. True (they are made by humans using different nature uses and chemical structures that cannot be found in nature)
5. False (a compound is made up of two or more different atoms that can bond or be broken down into simpler compounds)
Hope this helps:)
Explanation:
Which law represents a balanced chemical equation?
Ideal Gas Law
Newton's First Law of Motion
Newton's Second Law of Motion
Law of Conservation of Mass
Answers
Answer:
Law of Conservation of Mass
Explanation:
Balancing chemical equation means that the amount of moles of one atom on side must match the other, which makes sure that no atoms are created nor destroyed in the reaction process.
How is energy and gravity related to speed?
Answers
Answer:
In classical theories of gravitation, the changes in a gravitational field propagate. A change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces.
Explanation:
In classical theories of gravitation, the changes in a gravitational field propagate. A change in the distribution of energy and momentum of matter results in subsequent alteration, at a distance, of the gravitational field which it produces. In the relativistic sense, the "speed of gravity" refers to the speed of a gravitational wave, which, as predicted by general relativity and confirmed by observation of the GW170817 neutron star merger, is the same speed[1] as the speed of light (c).
(Science) PLS HELP I AM TIMED!! Lucia wants to arrange the four states of matter from lowest kinetic energy to highest kinetic energy. How should she arrange them?
liquid, solid, plasma, gas
liquid, solid, gas, plasma
solid, liquid, plasma, gas
solid, liquid, gas, plasma
Answers
Answer:
The right increasing order is Liquid, gas, plasma (the last option).
The bodies, depending on the temperature and pressure conditions, can be in the form of liquid, gas or solid. The liquid form corresponds to a form of less energy than the gas (the kinetic energy of the molecules of a liquid is insufficient to break the forces which materialize by the surface tension) but of energy superior to the solid form (contrary to the solid, the kinetic energy of the molecules is enough to make them move spontaneously relative to each other).
A plasma is a phase of matter made up of charged particles, ions and electrons. It possesses a kinetic energy superior to that of gases.
Explanation:
Hope this helps you, we went over this in the beginning of the year and it just stuck with me. We also took notes on it
Good luck
An object has a mass of 300g
a. what is it mass on Earth
b. what is it's mass on the moon
Answers
Answer:
300g
Explanation:
your weight will change but mass is constant and does not change.
Which would be a biotic factor in an ecosystem?
1)air
2)rain
3)algae
Answers
Answer:
3
Explanation:
because biotic are things you can touch
help me out here! please
Answers
Answer: The third one 0.750 L
Explanation: 1,000 Millilitres equal 1 Liter
500 + 250 = 750 (Not A Liter)
So 0.750 L
Answer:
0.75L
Explanation:
I guess you know what's the total milliliters he drank right? 750ml
To convert ml to L, you have to know 1000ml is equal to 1L. So all you have to do is to divide the 750 by 1000 which is 0.750ml.
