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Which one of the following elements exhibits singular valency?

June 1, 2025 by rawan239

Which one of the following elements exhibits singular valency?

Sulphur

Phosphorus

Sodium

Copper

This question was previously asked in

UPSC Geoscientist – 2022

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The correct answer is Sodium.

Valency is the combining capacity of an element. Some elements have a fixed valency (singular), while others exhibit variable valency.

Sodium (Na) is an alkali metal (Group 1) and typically loses one electron to form a +1 ion, exhibiting a fixed valency of 1. Sulphur (S) can have valencies of 2, 4, 6. Phosphorus (P) can have valencies of 3, 5. Copper (Cu) is a transition metal and commonly exhibits valencies of 1 and 2. Thus, sodium is the element among the options that exhibits a singular valency.

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