SSC MTS EXAM

Detailed explanation-1: -Helium is one of the noble gases and contains a full valence shell.

Detailed explanation-2: -Only krypton, xenon, and radon are known to form stable compounds. The compounds of these noble gases are powerful oxidizing agents (substances that tend to remove electrons from others) and have potential value as reagents in the synthesis of other chemical compounds.

Detailed explanation-3: -Neon is a chemical element with symbol Ne and atomic number 10. Classified as a noble gas, Neon is a gas at room temperature.

Detailed explanation-4: -The full valence electron shells of these atoms make noble gases extremely stable and unlikely to form chemical bonds because they have little tendency to gain or lose electrons.