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Line up three from one family

Exercise and reference answers

Grid
    1. Group
      Li Na K triad
      Item
      Li
    2. Group
      Cl Br I triad
      Item
      Cl
    3. Group
      Noble gases
      Item
      He
    1. Group
      Noble gases
      Item
      Ne
    2. Group
      Li Na K triad
      Item
      Na
    3. Group
      Cl Br I triad
      Item
      Br
    1. Group
      Li Na K triad
      Item
      K
    2. Group
      Noble gases
      Item
      Ar
    3. Group
      Cl Br I triad
      Item
      I
Groups
  1. Item
    Li Na K triad
  2. Item
    Cl Br I triad
  3. Item
    Noble gases
Instructions
Swap two neighbouring symbols so that three elements of one family sit in a line.

Explanation

_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.25_
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