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Multi-Electron Configurations and Orbital Diagrams

State and exp...

Question

State and explain the Aufbau principle, write electronic configuration of $C, C r, F e, C u$ .

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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 $[H e]^{2} 2 s^{2} 2 P^{2}$
Electronic configuration of $C r$ is $[A r]^{18} 3 d^{5} 4 s^{1}$
Electronic configuration of $F e$ is $[A r]^{18} 3 d^{6} 4 s^{2}$
Electronic configuration of $C u$ is $[A r]^{18} 3 d^{10} 4 s^{1}$

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