Whose most common oxidation state is -2?

Answer 1

Oxygen is the element whose most common oxidation state is -2.

In fact, it only shows oxidation states of +2,+1 in compounds OF2, O2F2.

It is because oxygen is the second most electronegative element behind Fluorine.

Answer 2

For oxygen yes, but for most other elements, no. Since most elements are metals, they will have positive oxidation states.

Answer 3

Oxygen(in Oxide ion), is the most commonly found element with - 2 oxidation state

Answer 4

Copper, Cobalt, Nickel, Lead, etc.

Answer 5

oxygen