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

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Solution

The correct option is A
30

Total number of electrons in $M^{+ 2}$ ion are 26 (Z =26)

mass number (A) =56

No. of neutrons =A - Z

=56-26

=30

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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

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

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

The correct option is A
30

Total number of electrons in $M^{+ 2}$ ion are 26 (Z =26)

mass number (A) =56

No. of neutrons =A - Z

=56-26

=30