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Option 3 : Hydrogen 

  • Alkali metals belong to Group 1 of the periodic table and these metals are: Lithium, Sodium, Potassium, Rubidium, Cesium and Francium.
  • Hydrogen is also placesd in this group due to the similar electron configurations as the alkali metals but hydrogen is not a metal.
  • Hydrogen is the only non-metal in the Group 1 of the periodic table with all the alkali metals.
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