Identify the element having zero valency
[amp_mcq option1=”Sulphur” option2=”Phosphorous” option3=”Lead” option4=”Radon” correct=”option4″]
This question was previously asked in
UPSC NDA-2 – 2016
– 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.