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Question

The electronic configuration of a dipositive metal M2+ is 2, 8, 14 and its atomic weight is 56 a.m.u. The number of neutrons in its nuclei would be


A

30

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B

32

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C

34

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D

42

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Solution

The correct option is A

30


Total number of electrons inM+2 ion are 26 (Z =26)

mass number (A) =56

No. of neutrons =A - Z

=56-26

=30


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