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Select the pair of atoms having the same...

Select the pair of atoms having the same number of electrons in their outermost shell

A

Na, Ca

B

Mg, Fe

C

As, Bi

D

Pb, Sb

Text Solution

Verified by Experts

The correct Answer is:
B, C
(a) `Na = [Ne] 3s^(1), Ca = [Ar] 4s^(2)`
(b) `Mg = [Ne] 3s^(2), Fe [Ar] 3d^(6) 4s^(2)`
(c) As and Bi belong to the same group with outer shell E.C. `= ns^(2) np^(3)`
(d) Pb and Sb lie in different groups
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