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The s-Block Elements

  • Group 1 elements: lithium, sodium, potassium, rubidium, caesium, and francium

  • Called alkali metals because their hydroxides are alkaline in nature

    Electronic Configuration

  • General outer electronic configuration is ns1.

    Physical Properties

  • Silvery white, soft, and light metals

  • Density increases down the group. (exception: Na is denser than K)

  • Low melting and boiling points − Reason: weak metallic bond due to the presence of only one electron in the outermost shell

Alkali metals form oxides on combustion.

  • The stability of peroxides or superoxides increases on moving down the group (i.e…

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