If the Aufbau principle had not been followed | vedclass

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(C) The electronic configuration of $Ca$ $(Z = 20)$ according to the Aufbau principle is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$.According to the Aufbau princ

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$d-$block

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(C) The electronic configuration of $Ca$ $(Z = 20)$ according to the Aufbau principle is $1s^2 2s^2 2p^6 3s^2 3p^6 4s^2$.According to the Aufbau principle,the $4s$ orbital is filled before the $3d$ orbital due to its lower energy.If the Aufbau principle were not followed,the $3d$ orbital would be filled before the $4s$ orbital.In that case,the electronic configuration of $Ca$ would be $1s^2 2s^2 2p^6 3s^2 3p^6 3d^2$.Since the last electron enters the $3d$ orbital,the element would be placed in the $d-$block.

If the Aufbau principle had not been followed,$Ca$ $(Z = 20)$ would have been placed in the

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