# Chemical bond-covalent-valence electrons OH-

I would like to ask how many valence electrons took part in creating chemical bond in $\ce{OH-}$? Is the minus related to $\ce{O}$ or to $\ce{H}$? Are there any spare valence electrons which didnt take part in creating chemical bond in $\ce{OH-}$?

There are 2 electrons took part in creating chemical bond in $\ce{OH}$. The first one is from oxygen.