Number of unpaired electrons in the electronic configuration $1{\text{s}}^2,2{\text{s}}^2,2{\text{p}}^4$ are 

The electronic configuration  $1{\text{s}}^2,2{\text{s}}^2,2{\text{p}}^4$ represents the element oxygen (O).

For oxygen, (Z = 8),

Therefore, the element with given electronic configuration $1{\text{s}}^2,2{\text{s}}^2,2{\text{p}}^4$  has total two unpaired electrons.