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Atoms

A neutral ato...

Question

A neutral atom has 12 electrons and 13 neutrons. What is its mass number?

A

12

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B

24

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C

13

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D

25

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Solution

The correct option is D $25$
Mass number = No. of protons + no. of neutrons.
Also no. of protons = no. of electrons = $12$
Therefore mass no. = $12 + 13 = 25$

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