So I'm taking honors chemistry, and we learned about how atoms will hybridize their orbitals to form sp, sp^2, sp^3, and so on, but i had a question my teacher didn't answer very well. If atoms can simply make 6 orbitals into 3 or four, why don't all atoms just automatically hybridize to achieve full hybridized sub levels? For example, why wouldn't an oxygen atom just become sp^2 hybridized so all of its orbitals would be filled? If atoms can do this, they all atoms with an even number of valance electron would be as non-active as the nobel gasses, correct?