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The number of electrons in K, L and M-sh...

The number of electrons in K, L and M-shell of an atom are 2.8 and 5 respectively. Calculate (i) the number of protons,
(ii) Number of electrons in the s-and p-sub-shell and (iii) the valency of the element.

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(i) 15 (ii) No. of s electrons=6, njumber of p electron=9 (iii) valency of the element=3.
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