The s-Block Elements
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Group 1 elements: lithium, sodium, potassium, rubidium, caesium, and francium
- Called alkali metals because their hydroxides are alkaline in nature
Electronic Configuration
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General outer electronic configuration is ns1.
Physical Properties
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Silvery white, soft, and light metals
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Density increases down the group. (exception: Na is denser than K)
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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.
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The stability of peroxides or superoxides increases on moving down the group (i.e…
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