Write the electronic configuration of Cl 17 35 .

The atomic number of Cl is 17 and hence, number of electrons present in chlorine atom is 17 . According to Octet rule, each shell can accommodate maximum of 8 electrons except K shell which can accommodate only 2 electrons. The electronic configuration will be- Element K shell L shell M shell Cl 2 8 7

Write the electronic configuration of P 15 31 .

Phosphorus has atomic number 15 , so the number of electrons present in the atom is 15 . According to Octet rule, each shell can accommodate maximum of 8 electrons except K shell which can accommodate only 2 electrons. The electronic configuration of Phosphorus is- Element K shell L shell M shell P 2 8 5

Write the electronic configuration of Ar 18 40 .

Argon has atomic number 18 , so the number of electrons present in the argon atom will be 18 . According to Octet rule, each energy shell (L shell, M shell, N shell...) can accommodate maximum of eight electrons except K shell which can accommodate maximum of two electrons. The electronic configuration of Argon is: Element K shell L shell M shell Ar 2 8 8