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One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of ___________.
- a)Carbon-12
- b)Nitrogen -14
- c)Carbon-1
- d)4.Silicon-14
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
One atomic mass unit is a mass unit equal to exactly one twelfth (1/12...
An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the mass of an atom of carbon-12. The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. In imprecise terms, one AMU is the average of the proton rest mass and the neutron rest mass.
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One atomic mass unit is a mass unit equal to exactly one twelfth (1/12...
It is based on the fact that the carbon-12 atom has 6 protons, 6 neutrons and 6 electrons. Of these the 6 electrons have negligible weight compared to the others (1 electron is around 1/1836 times as heavy as a proton). Protons and neutrons weigh almost the same at least at the accuracy levels during the time when the convention was adopted.
Hence 1 proton weighs equal to 1 neutron = 1/12 of a carbon-12 atom which has 6 protons and 6 neutrons.
And as the weight of all atoms is almost completely from the contained protons and neutrons, it is mentioned in terms of 1/12 carbon-12 atom.
So for example, oxygen has 8 protons and 8 neutrons, the weight of oxygen is approximately (8+8)*1/12 of carbon-12 atom.
I hope that this has solved your problem.
Hence 1 proton weighs equal to 1 neutron = 1/12 of a carbon-12 atom which has 6 protons and 6 neutrons.
And as the weight of all atoms is almost completely from the contained protons and neutrons, it is mentioned in terms of 1/12 carbon-12 atom.
So for example, oxygen has 8 protons and 8 neutrons, the weight of oxygen is approximately (8+8)*1/12 of carbon-12 atom.
I hope that this has solved your problem.
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One atomic mass unit is a mass unit equal to exactly one twelfth (1/12...
Explanation:
Atomic Mass Unit (amu):
- An atomic mass unit (amu) is defined as a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of carbon-12.
- It is used to express the relative masses of atoms and molecules.
- The atomic mass unit is approximately equal to the mass of a proton or a neutron.
Carbon-12:
- Carbon-12 is the most common isotope of carbon, and it has a mass of exactly 12 atomic mass units (12 amu).
- It is used as the standard for measuring atomic masses.
Explanation of Options:
a) Carbon-12:
- This option is correct because one atomic mass unit is defined as the mass of one atom of carbon-12.
b) Nitrogen-14:
- Nitrogen-14 is an isotope of nitrogen with a mass of 14 atomic mass units.
- It is not the standard for measuring atomic masses.
c) Carbon-1:
- Carbon-1 does not exist in nature. The most common isotope of carbon is carbon-12.
- Carbon-1 is not the standard for measuring atomic masses.
d) Silicon-14:
- Silicon-14 is an isotope of silicon with a mass of 14 atomic mass units.
- It is not the standard for measuring atomic masses.
Conclusion:
- One atomic mass unit is equal to exactly one twelfth the mass of one atom of carbon-12.
- Carbon-12 is used as the standard for measuring atomic masses.
Atomic Mass Unit (amu):
- An atomic mass unit (amu) is defined as a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of carbon-12.
- It is used to express the relative masses of atoms and molecules.
- The atomic mass unit is approximately equal to the mass of a proton or a neutron.
Carbon-12:
- Carbon-12 is the most common isotope of carbon, and it has a mass of exactly 12 atomic mass units (12 amu).
- It is used as the standard for measuring atomic masses.
Explanation of Options:
a) Carbon-12:
- This option is correct because one atomic mass unit is defined as the mass of one atom of carbon-12.
b) Nitrogen-14:
- Nitrogen-14 is an isotope of nitrogen with a mass of 14 atomic mass units.
- It is not the standard for measuring atomic masses.
c) Carbon-1:
- Carbon-1 does not exist in nature. The most common isotope of carbon is carbon-12.
- Carbon-1 is not the standard for measuring atomic masses.
d) Silicon-14:
- Silicon-14 is an isotope of silicon with a mass of 14 atomic mass units.
- It is not the standard for measuring atomic masses.
Conclusion:
- One atomic mass unit is equal to exactly one twelfth the mass of one atom of carbon-12.
- Carbon-12 is used as the standard for measuring atomic masses.
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One atomic mass unit is a mass unit equal to exactly one twelfth (1/12th) the mass of one atom of ___________.a)Carbon-12b)Nitrogen -14c)Carbon-1d)4.Silicon-14Correct answer is option 'A'. Can you explain this answer?
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