Periodicity: ionisation energies and atomic radii

Variation in first ionisation energies and atomic radii

• Nuclear charge
• Distance from nucleus
• Electron sheilding
• All affect ionisation energy

• Across each period, ionisation energy shows a general increase
• number of protons increases- more attraction acting on electrons
• Electrons are added to same shell- outer shell is drawn in slightly
• Same number of inner shells- sheilding will hardly change
• Attraction between nucleus & outer electron…