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In each of the following pairs, choose the atom having the bigger size:
(a) Mg (At. No. 12) or Cl (At. No. 17)
(b) Na (At. No. 11) or K (At. No. 19)
(a) Mg has a bigger size than Cl because the atomic size decreases on moving from left to right in a period of the periodic table.
(b) K has a bigger size than Na because the atomic size increases on going down in a group of the periodic table.
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