Q.

The atomic number of an element having the valency shell  electronic configuration 4s24p6 is

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a

35

b

36

c

37

d

38

answer is B.

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Detailed Solution

Complete    E.C. =[Ar]183d104s24p6Hence No. of e- = no. of protons = 36 = Z.
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The atomic number of an element having the valency shell  electronic configuration 4s24p6 is