The reactivity of redox reactions increases down group 2 because the atoms lose their two outer electrons more easily to form +2 ions.The first and second ionisation energies decrease down the group because the attraction between the nucleus and outer electrons decrease as a result of increasing atomic radius and increasing shielding.The group 2 elements become more reactive and become stronger reducing agents down the group.first IE: M(g) → M+(g) + e-secondIE: M+(g) → M2+(g) + e-
Trend in Reactivity
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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 4A: The elements of Groups 1 and 2. Topic: Group 2.
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.
- reducing agent
- A substance that donates electrons to another species, causing it to be reduced, while it is itself oxidised.
More in Group 2
- Group 2 Elements
- Trend In Ionisation Energy
- 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