alleryWhy is potassium more reactive than sodium?
APotassium has more valence electrons
BPotassium has higher ionisation energy
CPotassium has larger atomic radius
DPotassium has lower mass
Answer & Solution
Correct answer: C. Potassium has larger atomic radius
1. Both sodium and potassium have one valence electron.
2. Potassium lies one period below sodium in Group 1.
3. So potassium has one more electron shell.
4. Its valence electron is farther from the nucleus.
5. A weaker pull means the valence electron is lost more easily.
6. Easier electron loss makes potassium more reactive than sodium.
_Source: syllabus Science Ch 5 'Periodic Classification of Elements'_
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