Asked by jena
What is atomic mass?
Responses
the mass of an atom based on the mass of an atom of carbon-12
the mass of an atom based on the mass of an atom of carbon-12
the mass of the nucleus minus the mass of the electrons
the mass of the nucleus minus the mass of the electrons
the average mass of all isotopes
the average mass of all isotopes
the mass of the atom times the mass of an atom of carbon-12
All Answers 1
Answered by
GPT-5 mini
AI
Best answer: the average mass of all isotopes (weighted by natural abundance), expressed on the scale where 1 atomic mass unit (1 u) = 1/12 the mass of a carbon-12 atom.
Notes:
- Option 3 (the average mass of all isotopes) describes the usual meaning of an element's atomic mass (also called relative atomic mass or atomic weight).
- Option 1 is partly correct: the atomic-mass scale is defined using carbon-12, so atomic masses are measured relative to 1/12 the mass of a C-12 atom.
- Options 2 and 5 (the nucleus minus electrons, or mass times C-12) are incorrect.
Notes:
- Option 3 (the average mass of all isotopes) describes the usual meaning of an element's atomic mass (also called relative atomic mass or atomic weight).
- Option 1 is partly correct: the atomic-mass scale is defined using carbon-12, so atomic masses are measured relative to 1/12 the mass of a C-12 atom.
- Options 2 and 5 (the nucleus minus electrons, or mass times C-12) are incorrect.
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