Electron Pair Repulsion

What does the shape of molecules and molecular ions depend on?

The number of pairs of electrons in the outer shell of the central atom.

What can pairs of electrons be in a covalent bond?

Shared or unshared

What are shared electrons called?

Bonding pairs

What are unshared electrons called?

Lone pairs or non-bonding pairs.

What does the type electron pair affect?

How much it repels other electron pairs

Which type of pairs repel more?

Lone pairs repel more than bonding pairs

What are the greatest angles?

Between lone pairs of electrons.

Why are bond angles between bonding pairs reduced?

They're pushed together by lone pair repulsion.

What is the electron pair repulsion theory?

Bond angles between bonding pairs are reduced as they're pushed together by lone pair repulsion

What's the biggest angle size?

Lone pair / lone pair bond angles

What's the 2nd biggest angle size?

Lone pair / bonding pair bond angles

What's the smallest angle size?

Bonding pair / bonding pair bond angles