Molecule shapes and degrees

2 electron pairs around a central atom

Linear molecule

3 electron pairs around a central atom (all bonded)

Trigonal planar

3 electron pairs around a central atom (one lone pair)

Bent

4 electrons pairs around a central atom

tetrahedral

4 electrons pairs around a central atom (1 lone pair)

trigonal pyramidal

4 electrons pairs around a central atom (2 lone pairs)

bent tetrahedral

5 electron pairs around a central atom

trigonal bypyramidal

5 electron pairs around a central atom (1 lone pair)

Seesaw

5 electron pairs around a central atom (2 lone pairs)

Distorted T

6 electron pairs around a central atom

octahedral

6 electron pairs around a central atom (1 lone pair)

square pyramidal

6 electron pairs around a central atom (2 lone pairs)

square planar

what does a solid line represent in a molecule diagram

A solid line represents a bond that is in the same plane as the central atom (the nitrogen atom)

what does a solid wedge represent in a molecule diagram

A solid wedge represents a bond that is coming out of the plane, towards the viewer.

what does a dashed wedge represent in a molecule diagram

A dashed wedge (or a series of dashes) represents a bond that is going into the plane, away from the viewer.