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The mass number of a nucleus (except Hydrogen) is:
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The mass number of a nucleus (except Hydrogen) is:

User Ronnyrr
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The mass number of a nucleus (except Hydrogen) is: number of protons + number of neutrons.

A=Z+N

A=mass number=protons + neutrons.
Z=atomic number=number of protons.
N=number of neutrons.

In the case of Hydrogen it depends of isotope of Hydrogen .
the hydrogen has three isotopes,
protium : A=Z, because N=0
deuterium: A=Z+N; N=1
tritium: A=Z+N; N=2
User Baub
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Answer:

never less than its atomic number.

Step-by-step explanation:

User Craigmoliver
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