Question: How is an atom's atomic mass number determined? 1-The atomic mass number is determined only by the number ofnucleons in the nucleus. 2-The atomic mass

How is an atom's atomic mass number determined?

1-The atomic mass number is determined only by the number ofnucleons in the nucleus.

2-The atomic mass number is determined only by the number ofneutrons in the nucleus.

3-The atomic mass number is determined only by the number ofalpha particles emitted.

4-The atomic mass number is determined only by the number ofbeta particles emitted.

5-The atomic mass number is determined only by the number ofprotons in the nucleus.

6-The atomic mass number is determined only by the number ofelectrons in the atom.

which one is right ?

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