SSC JE Electrical Engineering 2017 Set 3 Paper

A germanium atom contains four valance electrons Atomic number of germanium is 32.
$32\Rightarrow {15}^2,{25}^2,{21}^6,{35}^{2}3{\mathit{P}}^6,3{\mathit{d}}^{10},{45}^2,4{\mathit{P}}^2$
or 2, 8, 18, 4
Germanium atom contain four electron in outer most shell. So valency of electron is four.