How many protons and neutrons are there in the nuclei of $_{12}^{25} M g$

12, 13

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13, 12

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25, 12

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12, 25

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Solution

The correct option is A 12, 13
Atomic no.(z)=12, mass no (A) = 25
No of proton = Atomic no = 12
No of neutron $=$ A $-$ no of proton
$= 25 - 12 = 13$

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