Question

Which of the following element is chemically inactive and has a high first ionization energy?

• A. A noble gas
• B. A transition element
• C. An alkali metal
• D. A halogen
• E. An alkaline earth metal

Answer 1

The correct option is A A noble gas

Noble gases have the largest first ionization potential among the elements of each period, which reflects the stability of their electron configuration and is related to their relative lack of chemical reactivity. They have a valency of zero, meaning their atoms cannot combine with those of other elements to form compounds.