Question

Write the electronic configuration of the noble gases starting from Helium and predict their atomic number ?

Answer 1

General electronic configuration of noble gas is ${\mathrm{ns}}^2{\mathrm{np}}^6$.

Noble gas	Electronic configuration	Atomic number
He	$1{\mathrm{s}}^2$	2
Ne	$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^6$	10
Ar	$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^6$	18
Kr	$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^{2}3{\mathrm{d}}^{10}4{\mathrm{p}}^6$	36
Xn	$1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}4{\mathrm{s}}^{2}3{\mathrm{d}}^{10}4{\mathrm{p}}^{6}5{\mathrm{s}}^{2}4{\mathrm{d}}^{10}5{\mathrm{p}}^6$	54