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(C) Valency is the combining capacity of an element. Elements with a valency of $1$ can be metals or non-metals. For example,Sodium $(Na)$ is a metal

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either metals or non-metals

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(C) Valency is the combining capacity of an element. Elements with a valency of $1$ can be metals or non-metals. For example,Sodium $(Na)$ is a metal with a valency of $1$ (it loses $1$ electron). Chlorine $(Cl)$ is a non-metal with a valency of $1$ (it gains $1$ electron). Therefore,elements with valency $1$ can be either metals or non-metals.

Elements with valency $1$ are

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