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Why Classification?

What is mass ...

Question

What is mass number of an atom which contains 28 protons,28 electrons,and 34 neutrons?

A

28

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B

56

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C

62

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D

90

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Solution

The correct option is C
62

Atomic mass is found by adding protons plus neutrons 28+34 =62 .Electrons have mass of nearly 0 so they are not counted in the formula for atomic mass.

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Why Classification?

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