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Question #81505

Mechanical Engineering

The mass number of a substance represents the sum of total number of___________________?

Options:

A) protons and neutrons in an atom

B) protons and electrons in an atom

C) neutrons and electrons in an atom

D) protons and neutrons in a nucleus

E) E. protons and electrons in a nucleus

Answer: The mass number of a substance represents the sum of total number of protons and neutrons in a nucleus.

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