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Question

In a group, the atomic size:


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Solution

Trends in atomic size:

  • As you go down from top to bottom, the number of energy levels or electron shells increases so the atomic radius of the elements increases.
  • In general, for the main group elements of the periodic table, the atomic radius increases down the group, from top to bottom.
  • Atomic radius decreases across a period, from left to right, of the periodic table.

Hence, the atomic size increases from top to bottom in a group because new shells are being added as we go down the group.


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