Consider the electronic configuration for atoms
(X) → [Ar]4s¹ (Y) → [Ar]5s¹
Which of the following statement(s) is/are NOT true?
(A) Energy is required to change from (X) to
(Y)
(B) (X) represents K-atom
(C) (X) and (Y) represent different elements (D) More energy is required to remove one
electron from (Y) than from (X)
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Explanation:
Correct options are A) , B) and C)
(a) Cr=[Ar]=3d
5
4s
1
, an exception to aufbau principle.
(b) For a given value of l, m can have any value from −l to +l so can have negative value.
(c) Ag is in copper group with d
10
s
1
configuration, ie, 46 electrons are spin paired.