Question

What is valency and why does the noble gases does not react with other elements ,please explain

Answer 1

The noble gases are the chemical elements in group 18 of the periodic table. Theyare the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since theyare already stable.
Group 8A elements are the noble gases and all have eight electrons in theoutermost energy level because their electron configuration ends in s²p⁶
yes, the last shell of the noble gas elements has 8 electrons that means the configuration of 2,8,8,8