Answer:
Group 18 elements
Noble gases
Explanation:
The gases in the last group of the periodic table exist in nature in uncombined state. Due to their nature of passiveness, they are called inert gases.
Other names include the noble gases. They are as follows
Helium
Neon
Argon
Radon
Xenon
These elements occur in as mono atomic atoms. Hence, they have an atomicity of 1
