Trends in Group 2 (reactivity, oxides, hydroxides, carbonates, thermal stability) and Group 17 halogens (volatility, oxidising power, displacement, disproportionation, halide tests).
Group 2 — the alkaline earth metals
Going down Group 2 (Be → Ba): atoms get larger, ionisation energies fall, and reactivity increases (electrons more easily lost). They react with water to form hydroxides and hydrogen:
Solubility of hydroxides increases down the group ( sparingly soluble, soluble) → alkalinity increases down.
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