Question

the electroinc configuration of a. element is 2,8,6 to which group or period of modern periodic table it belongs

Answer 1

grp=6th grp or VIA
period= 3 rd period
and this element is Sulfur

Answer 2

Here's your answer mate,

The element lies on the 16th period and 2nd group.

It is because, it has atom is number 16 and hence has 6 valence electrons. Therefore, it lies on 16th (10 + 6) period and since it has two shells, it lies on second group.

Hope that's useful.