(Polar molecules, Non-polar molecules, etc.)
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Molecules with 2 bonded pairs will either form a linear and bent shaped molecule. When the central atom has no lone pairs and has equal bonds between its neighboring atoms that are the same, it will have a linear shape.
A molecule will have linear structure when the central atom has no lone pairs. This is because the bonding pairs will lie on opposite sides of the central atom to be far apart. Examples are H2O and BeCl2. It helps to draw Lewis structures.
Water actually has a bent and not a linear shape because the two lone pairs of electrons sit next to each other rather than on opposite sides. If the two lone pairs are on opposite sides, then water would be nonpolar.
Sartaj Bal 3H wrote:It can be determined if a molecule has linear shape by looking at the number of bonding and lone pairs on the central atom. For example, molecules with the VSEPR notation of AX2 and AX2E3 both have linear shapes.
AX2E3 is an important one to remember--- even though the central atom has lone pairs it is still linear because their repulsions cancel out.
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