Which property increases down group II from beryllium to barium?
Correct answer: C. Solubility of the hydroxides in water
- A. First ionisation energy
- B. Electronegativity
- C. Solubility of the hydroxides in water
- D. Melting point of the metal
Explanation
Hydroxide solubility rises down the group, so magnesium hydroxide is only sparingly soluble while barium hydroxide dissolves appreciably, whereas the sulphates show the opposite trend and become less soluble. Ionisation energy and electronegativity both fall down a group as the atoms get larger. This contrast between hydroxides and sulphates is a favourite examination point.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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