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  4. Electronic configuration of calcium atom can be written as

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Q. Electronic configuration of calcium atom can be written as

AIPMTAIPMT 1992Structure of Atom

Solution:

To write the electronic configuration of an atom, it is better if we remember the atomic number of noble gases and the orbitals follow the noble gas. The atomic number of $Ca$ is $20$ and its nearest noble gas is argon $( Ar =18)$.
Hence, the electronic configuration of $Ca =[ Ar ] 4 s^{2}$.