The number of electrons, protons and neutrons in an atom whose atomic number is 11 and mass number 23 will be:

11, 11, 12

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11, 12, 11

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12, 11, 11

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23, 11, 23

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Solution

The correct option is A $11, 11, 12$
Mass number $=$ 23 and atomic number $=$ 11.

Atomic number $=$ Number of electrons $=$ Number of protons $= 11$ .

Number of neutrons $=$ Mass number $-$ atomic number $= (23 - 11) = 12$ .

Hence, option A is correct.

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