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Q.

What is the number of protons if the atomic number of magnesium is 12?

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a

11

b

13

c

12

d

10

answer is D.

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Detailed Solution

The atomic number is defined as the total number of protons present in the nucleus of an atom. Magnesium has 12 protons in the nucleus and so the atomic number of magnesium is 12.

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