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B the atomic number of nitrogen is 7. what is the mass number of a nitrogen atom with 6 neutrons? express your answer as an integer.

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Answer is: the mass number of a nitrogen atom is 13.

Atomic number (Z) is total number of protons and mass number (A) is total number of protons and neutrons in a nucleus:

p⁺(N) = 7; number of protons in nitrogen atom.

n°(N) = 6; number of neutrons in nitrogen atom.

A(N) = p⁺(N) + n°(N).

A(N) = 7 + 6.

A(N) = 13.

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