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Q.

Which of the following have the same number of electrons in outermost shell?

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a

Elements with atomic numbers 30, 48, 80

b

Elements with atomic numbers 14, 15, 16

c

Elements with atomic numbers 20, 30, 50

d

Elements with atomic numbers 10, 18, 26

answer is A.

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Detailed Solution

Zn (Z=30), Cd (Z=48),Hg(Z=80) belong to the same grouop (12th group) with the outer configuration (n-1)d10ns2
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