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Q.

An atom has 2 electrons in K shell, 8 electrons in L shell and 6 electrons in M shell. The number of s -electrons present in that element is

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a

6

b

5

c

7

d

10

answer is A.

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Detailed Solution

Shell =K,L,M=1s22s22p63s23p4Hence the number of s electron is 6 in that element.
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An atom has 2 electrons in K shell, 8 electrons in L shell and 6 electrons in M shell. The number of s -electrons present in that element is