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Formula	I Lewis Structure	II Reso-  nance	III Number of Bonded Atoms (number of atoms to which central atom is bonded.)	IV Number of Lone Pairs (on central atom)	V Overall Arrangement of the Charge Clouds (lone pairs + bonded atoms) These Rotate! Click-and-hold the mouse button over the molecule to rotate.	VI Geometry of  Atoms These Rotate! Click-and-hold the mouse button over the molecule to rotate.	VII Bond Angles (around central atom)	VIII Hybrid-  ization	IX Bonds  Sigma/Pi (total number in structure)
CN-		No	N/A	N/A	(lone pairs shown in pink)	Linear	N/A	sp	1 sigma  2 pi
CO2		Yes	2	0	2 charge clouds	Linear	180	sp	2 sigma  2 pi
NO2-		Yes	2	1	3 charge clouds (lone pair shown in pink)	Bent	ONO is less than  120	sp2	2 sigma  1 pi
SO2		Yes	2	1	3 charge clouds (lone pair shown in pink)	Bent	OSO is less than 120	sp2	2 sigma  1 pi
CO32-		Yes	3	0	3 charge clouds	Trigonal Planar	120	sp2	3 sigma  1 pi
BCl3		No	3	0	3 charge clouds	Trigonal Planar	120	sp2	3 sigma
SO42-	Note: There are four resonance structures of the type on the right.	Yes	4	0	4 charge clouds	Tetrahedral	109.5	sp3	4 sigma  0 pi  or 4 sigma  2 pi
CH3Cl		No	4	0	4 charge clouds	Tetrahedral (slightly distorted from a perfect tetrahedral)	~109.5	sp3	4 sigma
NH3		No	3	1	4 charge clouds (lone pair shown in pink)	Trigonal Pyramidal	<109.5	sp3	3 sigma
PCl5		No	5	0	5 charge clouds	Trigonal Bipyramidal	120, 90, & 180	sp3d	5 sigma
SF6		No	6	0	6 charge clouds	Octahedral	90 and  180	sp3d2	6 sigma
Formula	Lewis Structure	Reso-  nance	Number of Bonds	Number of Lone Pairs	Overall Arrangement of the Charge Clouds (lone pairs + bonded atoms)	Geometry of  Atoms	Bond Angles	Hybrid-  ization	Bonds  Sigma/Pi (total number in structure)

Part B: More Complex Molecules

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