Fourth Row Elements

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In potassium (Z=19) and calcium (Z=20), electrons enter the 4s-orbitals in accordance with the fact that 4s-orbital is slightly lower in energy than 3d-orbital.

With scandium (Z=21), 3d-subshell comes into use and from scandium to zinc, this subshell is gradually filled up.

The electronic configurations of the elements from scandium (Z=21) to zinc (Z=30) are given below:

electronic configurations of the elements from scandium to zinc


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