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2015-11-09T20:12:50+05:30

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M shell has 10 electrons.
K shell can accomodate a maximum of 2 e- whereas L shell can accomodate 8 e-
So the total electrons in M shell= 2+8= 10 electrons
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which element is this
is it calcium?
Yes. It is calcium. The total no. of electrons is 20.
kk
2015-11-13T13:42:27+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
K shell => n = 1   =>  number of electrons (max) = 2 n² = 2
L shell => n = 2  =>  number of electrons max  =  2 n² = 8
M shell .  n= 3.           max num of electrons =  18
 
But given,  electrons in  orbit n = 3 are 2 + 8 = 10
The total num of electrons in the atom =  2 + 8 + 10 = 20  = Z
The valency shell is  M shell, as it is not completely filled and the two lower orbits are completely filled.

       Valency shell is  M shell => num of electrons = 10.

The chemical element with Z = 20, is Calcium.

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