Question

Which of the following configuration is not possible? (A) 2p²? (B) 3p⁷? (C) 3d⁵ (D) 4p⁶​

Answer 1

The electronic configuration 3f12 is not possible as third energy level can have s,p and d orbitals only. For f orbital, l=3. But for third energy level n=3 and =l=0,1,2 as l can have values 0 to n−1.

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Answer 2

Option B → 3p⁷

Explanation:

KNOW MORE :-

• Electronic configuration of an element gives the information of valence electrons and number of shell present in the element. We get the information of group number after knowing valence electrons.

• Thus, by knowing electronic configuration we know the group number and period number of an element, and the position of an element in the periodic table.