There are 18 groups in the modern periodic table, numbered from 1 to 18.

Quick Scoop

  • The vertical columns in the periodic table are called groups (or families).
  • In the current IUPAC system, these groups are numbered from 1 to 18, left to right.
  • All elements in the same group have similar outer electron structures, so they show similar chemical properties.

So if you’re just looking for the key fact for exams or quick revision:
Number of groups in the periodic table = 18.

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