Write the valency of the following ions:
(a) ${N a}^{+}$
(b) $F^{-}$
(c) $O^{2 -}$

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Solution

(a) ${N a}^{+}$ : Sodium ion combines with one anion, thus its valency is 1. [1 Mark]
(b) $F^{-}$ : Fluorine ion combines with one cation, thus its valency is 1. [1 Mark]
(b) $O^{2 -}$ : Oxygen ion combines with two cations, thus its valency is 2. [1 Mark]

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