If the Aufbau rule were not followed,then Ca | vedclass

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(C) The atomic number of $Ca$ is $20$. According to the $Aufbau$ principle,the electronic configuration is $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s

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$d-$ block

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(C) The atomic number of $Ca$ is $20$. According to the $Aufbau$ principle,the electronic configuration is $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 4s^2$. If the $Aufbau$ rule were not followed and electrons filled orbitals in the order of increasing principal quantum number $(n)$,the configuration would be $1s^2 \, 2s^2 \, 2p^6 \, 3s^2 \, 3p^6 \, 3d^2$. Since the last electron enters the $3d$ orbital,$Ca$ would belong to the $d-$ block.

If the $Aufbau$ rule were not followed,then $Ca$ would belong to which block?

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