AS chemistry- ionisation energy

What is ionisation energy?

the amount of energy needed to remove one electron from each atom, in a mole of atoms, in the gas phase. 

There are 3 factors that affect the amount of ionisation energy needed to remove the outer electron. These are...

1) Electron shielding

2)Atomic radii

3)Nuclear charge

Electron shielding

• electron shielding is where electrons in the inner energy levels 'shield' the positive charge of the nucleus, so other electrons are not as strongly attracted to the nucleus.
• As the number of energy levels increases the nucleus is shielded more by electrons. So the strong nuclear attraction between the oppositely charged protons and electrons decreases.
• This means that, as the number…