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The elements Li, Na and K, each having o...

The elements Li, Na and K, each having one valence electron, are in period 2, 3 and 4 respectively of modern periodic table.
(a) In which group of the periodic table should they be ?
(b) Which one of them is least reactive ?
(c) Which one of them has the largest atomic radius ? Give reason to justify your answer in each case.

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