What is the "mass number" of an atom?

1 Answer
anor277 ยท Truong-Son N.
May 29, 2017

"The mass number of an atom............."

Explanation:

The mass number of an atom is its "atomic number," Z, PLUS its number of neutrons.....i.e. it is the number of massive nuclear particles. The mass number is specific to a particular isotope. Can you tell me the mass numbers of the following hydrogen isotopes: ""^1H, ""^2H, and ""^3H?

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