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Question
Which one of the following has the largest atomic radius?
Options
Sodium
Potassium
Magnesium
Aluminium
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Solution
Potassium
Explanation:
Potassium (K) has the largest atomic radius compared to sodium (Na), magnesium (Mg), and aluminium (Al), which belong to periods 3 and 4 respectively. Potassium has the largest atomic radius among the elements, which means that atomic size increases with decreasing group.
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