Answer
The lewis structures can be found in the image below.
Work Step by Step
To draw the lewis structure of a compound, you first need to calculate the total number of valence electrons ($TVE$) it has. To calculate that, all you have to do is add up the number of valence electrons each atom has (Tip: you can find out an element's number of valence electrons by checking the periodic table). For example, in $CH_{2}N_{2}$ there is a total of 16 valence electrons.
$(V_{C}\times A_{C})+(V_{H}\times A_{H} )+(V_{N}\times A_{N}) = TVE$
$(6\times1)+(1\times2)+(5\times2) = TVE$
$V_{C}$ = number of valence electrons of C
$V_{H}$ = number of valence electrons of H
$V_{N}$ = number of valence electrons of N
$A_{C}$ = number of C atoms
$A_{H}$ = number of H atoms
$A_{N}$ = number of N atoms
Also, keep in mind that if the compound is an anion, you have to add the charge of the ion to the $TVE$. However, if it is a anion you have to subtract it.
After calculating the $TVE$, put two electrons between atoms to form chemical bonds. Then, all you have to do is complete the octets for the remaining atoms. Make sure that the number of electrons you place is equal to the calculated $TVE$.
