alleryWhich is the most reactive metal?
ASodium
BPotassium
CCalcium
DCaesium
Answer & Solution
Correct answer: D. Caesium
1. Metallic reactivity increases down Group 1.
2. Larger atoms lose their single valence electron more easily.
3. Caesium is the heaviest stable alkali metal.
4. So caesium is the most reactive of those listed.
5. Francium is more reactive but is rare and radioactive.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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