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The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having largest atomic radius is:

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The atomic numbers of the elements Na, Mg, K and Ca are 11, 12, 19 and 20 respectively. The element having largest atomic radius is:

(a) Mg

(b) Na

(c) K

(d) Ca

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