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The first group can be called the Alkali metals or Lanthanoids
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Elements in the first group have one outer shell electron and are extremely reactive they are called: Alkali metals.

Alkali metals refers to any of the monovalent chemical elements that are found in Group IA of the periodic table. These group of chemical elements readily lose a single valence electron (monovalent) in order to form ionic compounds with non-metals. Some examples of alkali metal are;

  • Potassium (K).
  • Hydrogen (H).
  • Lithium (L).
  • Sodium (Na).

This ultimately implies that, alkali metals are chemical elements that are found in the first group and they usually have one outer shell electron. Also, alkali metals are extremely reactive chemical elements.

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