Question

The group whose element show zero valency ​

Answer 1

Group 8 on periodic table has valency of zero for its elements like Helium, Neon, Argon, Krypton and Xenon. They have 8 electrons in their outer most (except He which just 2 in first orbit and hence meets neutral element tag requirements). Hence they will not react with other elements.

Answer 2

This Group includes all the noble gases