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Q. Total number of electrons contained in all the $p$-orbitals of bromine is

Rajasthan PMTRajasthan PMT 2003Structure of Atom

Solution:

Electronic configuration of $Br$ is
$1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{5}$
Hence total number of electrons in $p$-orbital
$=6+6+5=17$