The mass number of a substance represents the sum of total number of Options: A . &nbspProtons and neutrons in an atom B . &nbspProtons and electrons in an atom C . &nbspNeutrons and electrons in an atom D . &nbspProtons and neutrons in a nucleus

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

Question - 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

Answer: Option D

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