Question

Gold is not reactive with oxygen? And why.?? Answer may contain figure please if possible.

Answer 1

Because of a special stability in full and half-full orbitals.

Silver and gold have a single outer electron. This seems disadvantageous, energy-wise, until you look at the orbitals the electrons are in. The lone electron is in an S-orbital. This orbital is thus half full (since s-orbitals can contain 2 electrons), whereas all the other inner orbitals in silver and gold are filled, and hence exceptionally stable. After a full orbital, the next most stable orbital is a half full one.

With this stability, they are most likely won't form any compound in normal and natural conditions, that's why gold ussually found in its native form.

If you don't learn about the electron configuration yet, and do not understand what I mean, the answer is simply : Because Gold and Silver is very stable and less reactive. So they most likely to exist natively than form compound with oxygen.

Even in industry, high temperature of heating is needed to make Gold Oxide due to the stability of the atom.