O-LevelChemistryMetals & Reactivity5070/12 · May/June 2021 · Q281 Mark

The proton number of caesium is 55. Compared with lithium, the melting point of caesium is ......1...... and the reaction of caesium with water is ......2...... vigorous. The number of valence electrons in caesium is ......3...... compared to lithium. Which words correctly complete gaps 1, 2 and 3?

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A1: higher, 2: more, 3: the same

B1: higher, 2: less, 3: the same

C1: lower, 2: more, 3: greater

D1: lower, 2: more, 3: the same

✓ Correct answer

D: 1: lower, 2: more, 3: the same

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Topic: Metals & Reactivity, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, May/June 2021 Paper 1 Variant 2, question 28.

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