PART I

$1.$ On a separate piece a paper draw the Lewis structures for each compound. Indicate resonance forms, if appropriate, and provide electron geometry and molecular shape $($geometry$)$ for central atom, bonding electrons and lonely electron pairs.

thiocyanate ion $($SCN$-),$ C$-$central atom

nitrate ion $($NO$3-).$ N$-$central atom

ammonium ion $($NH$4+).$ N$-$central atom

formaldehyde $($H$2$CO$).$ C$-$central atom

dichlorodifluoromethane $($CCl$2$F$2).$ C$-$central atom

cyanide ion $($CN$-).$ C$-$central atom

hydrogen cyanide $($HCN$).$ C$-$central atom

methanimine $($CH$2$NH$).1$st: C$-$central atom, $2$nd: N$-$ central atom

hydrogen peroxide $($H$2$O$2).$ O$-$central atom

sulfite ion $($SO$32-).$ S$-$central atom