NDA 2016 Chemistry question

Identify the element having zero valency

(A)Sulphur
(B)Phosphorous
(C)Lead
(D)RadonCorrect

Answer: (D)

Solution

Valency is the combining capacity of an element, fixed by the number of electrons it must gain, lose or share to complete its outer shell. Radon is a noble gas with a

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Question ID VK-030554