This is the NH2- Lewis structure. We have five
valence electrons for nitrogen.
Plus one for hydrogen, but we have two hydrogens then we need to add this
extra valence electron in for a total of eight
valence electrons for the NH2- Lewis structure.
We put nitrogen in the center and the
hydrogens
always go on the outside.  We have eight
valcence electrons so we'll put
2  between atoms to form chemical bonds.
We've used four.
And then complete the octet on nitrogen.  Six, and eight.
At this point to the hydrogens
have 2 valence electrons so their outer shell is full
and nitrogen needs an octet. It has
eight valence electrons
so its octet is full.  So this is the Lewis
structure for NH2-.
One last thing: it is an ion
so we do need to put brackets around it, and a negative sign. And that's it: that's the NH2- Lewis
structure.  This is Dr. B, and thanks for
watching.
