Question #39125

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Question #39125

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Answer 1 · 2017-06-09T12:54:16

Because M shell has the capacity for $8$ $8$ electrons. Secondly, $18$ $18$
is used for all the sub shells in the M shell.

Explanation:

M shell has the capacity to store $8$ $8$ electrons.
We have divided $18$ $18$ in three sub shells of the shell M ,e.g.,
$3 s = 2$ $3s = 2$
$3 p = 6$ $3p = 6$
$3 d = 10$ $3d = 10$
Now add them,
$2 + 6 + 10$ $2+6+10$ = $18$ $18$
Electronic configuration of $C a$ $Ca$ =
$1 s^{2}, 2 s^{2}, 2 p^{6}, 3 s^{2}, 3 p^{6}, 4 s^{2}$ $1s^2, 2s^2,2p^6, 3s^2,3p^6, 4s^2$ , where;
$K = 2$ $K = 2$
$L = 8$ $L = 8$
$M = 8$ $M = 8$
$N = 2$ $N = 2$

You can take $18$ $18$ as a whole but, if you'll take the M shell it contains 8 electrons, if we'll also count its sub shell electro configuration then it will be greater than 8.

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Question #39125

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