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Question

State and explain the Aufbau principle, write electronic configuration of C,Cr,Fe,Cu.

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Solution

The Aufbau principle states that in the ground state of an atom or ion, electrons fill atomic orbitals of the lowest available energy levels before occupying higher levels.
Electronic configuration of C is [He]22s22P2
Electronic configuration of Cr is [Ar]183d54s1
Electronic configuration of Fe is [Ar]183d64s2
Electronic configuration of Cu is [Ar]183d104s1

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