The correct electronic configuration of element having mass number 24 and number of neutrons 12 is

2,8,1

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2,8,2

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2,8

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2,8,3

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Solution

The correct option is B 2,8,2
No. of protons = mass number-number of neutrons $= 24 - 12 = 12$ that is equal to number of electrons. K shell will have 2 electrons. L shell will have 8 electrons. M shell will have 2 electrons.

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