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Q. Number of completely filled orbitals in xenon atom $(Xe)$ is

AP EAMCETAP EAMCET 2018

Solution:

The electronic configuration of xenon having atomic number $54$ is given as:

$_{54}Xe =1 s^{2}, \,2 s^{2} \,2 p^{6}, \,3 s^{2} \,3 p^{6} \,3 d^{10},\, 4 s^{2} \,4 p^{6}\, 4 d^{10}, \,5 s^{2} 5 p^{6}$

Thus the number of completely filled orbital in xenon atom $( Xe )$ is $27$ .