Identify the element having zero valency

Sulphur

Phosphorous

Lead

Radon

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UPSC NDA-2 – 2016

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Valency is the combining capacity of an element. Elements with zero valency are those that are chemically inert and do not readily form chemical bonds under normal conditions because their outermost electron shell is full. These elements are the noble gases. Among the given options, Radon (Rn) is a noble gas.

– Sulphur (S) typically has valencies of 2, 4, or 6.
– Phosphorous (P) typically has valencies of 3 or 5.
– Lead (Pb) typically has valencies of 2 or 4.
– Radon (Rn) is a noble gas (Group 18 of the periodic table) and its valency is considered zero.

Noble gases (Helium, Neon, Argon, Krypton, Xenon, and Radon) have a stable electron configuration with a full outermost electron shell (except Helium, which has 2 electrons in its single shell), making them very unreactive.

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