The formula of the hydride of the halogen in period 3.
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HCl
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The non-metal in period 3 having a valency 1.
The formula of the hydroxide of the element having electronic configuration 2, 8, 2.
The formula of the sulphite of the element in period-3, group 1 [IA].
The element in period-3 which does not form an oxide.