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

Mechanical Engineering Mcqs

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

(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)  protons and electrons in a nucleus



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