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Atomic Number

If the mass n...

Question

If the mass number of an atom is 24, then its atomic number is:

A

24

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B

12

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C

8

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D

48

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Solution

The correct option is B 12
Mass number = number of protons + number of neutrons.
Here, the mass number of the neutral atom is 24, which means it has 12 protons and 12 neutrons.
Atomic number = number of protons = 12.

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