MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Inorganic ChemistryPeriodic PropertiesModern Periodic Table

Which of the following represents an excited state of an atom?

A.[Ne] 3s2 3p6 4s2 3d8

B.[Ne] 3s2 3p6 4s1 3d5

C.[Ne] 3s2 3p6 4s2 3d1

D.1s2 2s2 2p5 3s1✓ Correct

Explanation

Normally, the electronic configuration of atom is filled as per the following figure- Thus, the general electronic configuration is given by- 2 2 6 0 1 2 2 3 s s p s But in excited state is- 2 2 5 1 1 2 2 3 s s p s Thus, the correct option is (d) 2 2 5 1 1 2 2 3 s s p s

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