for an oxygen atom,wich requeres more energy,the addition of two electrons or the removal of one electron?explain why

Answer 1

I don't know, sorry. I use to be so good at Chemistry.

Answer 2

It much prefers to add two electrons over removing one electron. The removal of an electron must expend energy to remove a negatively charged electron from the positively charged nucleus. Adding two electrons actually gives up energy because the outside shell is being filled.