Which of the following are correct about - He, Ne etc?
They are very stable elements.
They do not form bonds with their own species.
They are noble gases.
Group 18 elements are called Noble gases. These elements have completely filled outer electron shells and hence do not have any inclination to react with other elements. They are often found as monoatomic gases. Thus, the are very stable elements.
They very rarely form compounds with other elements.