Which of the following groups represents zero valency?

Correct option is A

The correct answer is (a) 18

• Elements with zero valency are the noble gases, or inert gases, which are in group 18 of the periodic table: Helium (He), Neon (Ne), Argon (Ar), Krypton (Kr), Xenon (Xe), and Radon (Rn).
• These elements have zero valency because their outermost shells are completely filled, making them chemically inert and unable to combine with other elements.

Information Booster:

• Valency is a measure of an atom's ability to combine with other atoms to form chemical compounds or molecules.
• It's generally the number of chemical bonds an atom of a given element forms.