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Which of the following has the largest atomic radius?
APotassium
BSodium
CLithium
DHydrogen
Answer & Solution
Correct answer: A. Potassium
1. Atomic radius grows down a group as more shells are added.
2. Hydrogen has only one shell (smallest).
3. Among the alkali metals listed, potassium is the lowest in Group 1.
4. So potassium has the largest radius of the four.
5. Caesium would be larger still but is not in the options.
_Source: NCERT Class 10 Science Ch 5 'Periodic Classification of Elements'_
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