Question

Count Valence e-	Formula	Electron Geometry	Molecular Geometry
1 N = 5 3 H = 3 8 / 2 = 4 pair	NH3	Tetrahedral	Trigonal pyramidal
	H2O
	CBr4
	SO3 This is not a polyatomic ion … No charge!!!
	PI3
	CH3Cl Carbon is the central atom
	NO31-
	CO32-
	NH4+1
	CH4
	SO2

Answer 1

Count Valence e-	Formula	Electron Geometry	Molecular Geometry
1 N = 5 3 H = 3 8 / 2 = 4 pair	NH3	Tetrahedral	Trigonal pyramidal
1 O = 6 2 H = 2 8 / 2 = 4 pair	H2O	Tetrahedral	Angular
1 C = 4 4 Br = 4x7 = 28 32 / 2 = 16 pair	CBr4	Tetrahedral	Tetrahedral
1 S = 6 3 O = 3x6 = 18 24 / 2 = 12 pair	SO3 This is not a polyatomic ion … No charge!!!	trigonal planar	trigonal pyramidal
1 P = 5 3 I = 3x7 = 21 26 / 2 = 13 pair	PI3	tetrahedrol	trigonal pyramidal
1 C = 4 3H = 3x1 = 3 1 Cl = 1x 7 =7 14 / 2 = 7 pair	CH3Cl Carbon is the central atom	tetrahedrol	tetrahedrol
1 N = 5 3O = 3x6 = 18 23+1 / 2 = 12 pair	NO31-	trigonal planar	trigonal planar
1 C = 4 3O = 3x6 = 18 22+2 / 2 = 12 pair	CO32-	trigonal planar	trigonal planar
1 N = 5 4H = 4x1 = 4 9-1 / 2 = 4 pair	NH4+1	tetrahedrol	tetrahedrol
1 C = 4 4H = 4x1 = 4 8 / 2 = 4 pair	CH4
1 S = 6 2 O = 2x6 = 12 18 / 2 = 9 pair	SO2	linear	bent