What is this element's electron configuration of Оxygen?
(2,5)
(1,6)
(2,6)
(4,2)

(2,6)

Explanation:

In the electron configuration there are seven atomic shells the first is k which can occupy two electrons so in the oxygen which has 8 atomic number we give two for the k shell and we give the rest six for l shell which occupy eight electrons

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons