# Question #a9dd1

Nov 30, 2017

There are many, but the two you're likely being asked for are:

• Hydroxide ($O {H}^{-}$)
• Ammonium ($N {H}_{4}^{+}$)

#### Explanation:

There are many polyatomic ions that don't end in "-ite" or "-ate". For example:

• Hydroxide ($O {H}^{-}$)
• Ammonium ($N {H}_{4}^{+}$)
• Cyanide $\left(C {N}^{-}\right)$
• Peroxide (${O}_{2}^{2 -}$)

The first 2 are likely the ones that you're being asked for -- they're extremely common across general chemistry, and it will do you credit to have them memorized.

Hope that helped :)