BRAINCAKETrend In Ionisation Energy
Group 2 first ionisation energies decrease down the group as the elements get more reactive. This is because the atomic radius increases down the group as:
• the number of filled inner shells increases so the shielding (the force of repulsion of the inner shell electrons) increases
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Key terms in this lesson
- ionisation energy
- The energy needed to remove one electron from each atom in one mole of gaseous atoms, forming one mole of gaseous 1+ ions.
More in Group 2
- Group 2 Elements
- Trend in Reactivity
- Reactions with Oxygen
- Reactions with Chlorine
- Reactions with Water
- Magnesium and Steam
- Reactions of Oxides with Water
- Trends in Solubility of the Hydroxides
All 16 lessons in Group 2 · All Edexcel AS-level Chemistry topics