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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

Submitted By :Ali Uppal

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