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2014-11-29T13:20:05+05:30

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Since the number of electrons in M shell is equal to sum of electrons in K and L shells, the K and L shells will be fully filled.

Maximum number of electrons  in K-shell is 2 and in M-shell is 8. total number of electrons in K and M shell are 10.So the number of electrons in M shell is also 10.
Total electrons is 10+10 = 20.
So K has 2, L has 8 and M has 10 electrons.

A) The outermost shell is M
B) Number of electrons in outermost shell is 10
C) Atomic number is 20
D) Atomic configuration - K has 2, L has 8 and M has 10 electrons.
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but for the same answer i was not awarded marks