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  4. The total number of electrons present in all the p-orbitals of bromine is:

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Q. The total number of electrons present in all the p-orbitals of bromine is:

Bihar CECEBihar CECE 2001Structure of Atom

Solution:

Write electronic configuration of Br atom according to aufbau rule and count number electrons of p-orbitals.
Br, atomic number is 35.
Configuration of bromine is
$ 1{{s}^{2}},2{{s}^{2}},2{{p}^{6}},3{{s}^{2}},3{{p}^{6}},4{{s}^{2}},3{{d}^{10}},4{{p}^{5}} $
$ \therefore $ Total p electrons in $ Br=6+6+5=17 $ac