# What is the simplest formula for copper (II) and nitride?

Oct 28, 2016

$C {u}_{\text{3"N_"2}}$

#### Explanation:

The easiest way of thinking about the combination of ions is by using the method I recall as being called , "the swap and drop"

So we have two ions,

$C {u}^{2 +}$ and ${N}^{3 -}$

now we swap the charge of each and drop, Note that the two ions have to be of opposite charge.

$C {u}_{\text{3}}$ and ${N}_{2}$

Now combine,

$C {u}_{\text{3"N_"2}}$

This is the simplest formula.