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  4. Element with atomic number 38, belongs to

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Q. Element with atomic number 38, belongs to

MP PMTMP PMT 2008Classification of Elements and Periodicity in Properties

Solution:

The electronic configuration of atomic number 38 is
X ( 38) $ 1s^2, \, 2s^2 \, 2p^6, \, 3s^2, \, 3p^6, \, 4s^2, \, 3d^{10} \, 4p^6, \, 5s^2 $
or $ 1s^2, \, 2s^2, \, 2p^6, \, 3s^2, \, 3p^6, \, 3d^{ 10}, \, 4s^2, \, 4p^6, \, 5s^2 $
Hence, it belongs to IIA group and 5th period. It is strontium (Sr).