What is Ionisation energy?

Define the term, 'First Ionisation Energy'

Factors that affect ionisation energy

Atomic Radius

Nuclear Charge

Shielding

Two key patterns of first ionisation energy in the first 20 elements in the periodic table.

Trend in first ionisation energy down a group

Trend in first ionisation energy across a period

Trend in first ionisation energy across a period - Period 2

Trend in first ionisation energy across a period - Period 2, the fall from Be to B

Trend in first ionisation energy across a period - Period 2, the fall from N to O

Successive Ionisation Energies