Na, K, Li, which of the elements is the largest in size and which is the smallest in size ?

Na, K, Li, which of the elements is the largest in size and which is the smallest in size ?
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Among the elements Na, K, Li, Potassium ( K) is the largest in atomic size and Lithium ( Li) is the smallest in atomic size.
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The increasing order of reactivity among group 1 elements is Li<Na<K<Rb<Cs whereas among the group 17 elements, it is F>Cl>Br>I. Explain.

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why Li salts are hydrated?

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