A vertical column in the periodic table. All elements in the same group have the same properties. e.g. Group 1 elements all react with water.


A mathematical system consisting of elements from a set G and a binary operation * such that

  1. x*y is a member of G whenever x and y are
  2. (x*y)*z=x*(y*z) for all x, y, and z
  3. there is an identity element e such that e*x=x*e=e for all x
  4. each member x in G has an inverse element y such that x*y=y*x=e

See also: Periodic Table.

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Subjects: Algebra Chemistry