Which of the following are two characteristics of inert atoms?

• A. They have high metallic character and readily lose electrons.
• B. They have a complete valence electron shell and are chemically unreactive.
• C. They have incomplete valence shells and easily form ions.
• D. They form many compounds and have high electronegativity.

Answer: (B)

Verified step by step guidance

1. Understand that inert atoms refer to elements that are chemically stable and do not easily react with other elements.
2. Recall that chemical reactivity is largely determined by the electron configuration, especially the valence (outermost) electron shell of an atom.
3. Recognize that inert atoms typically have a complete valence electron shell, meaning their outermost energy level is fully occupied by electrons, which makes them stable.
4. Know that because their valence shells are full, inert atoms are chemically unreactive and do not readily gain, lose, or share electrons to form compounds.
5. Conclude that the two key characteristics of inert atoms are having a complete valence electron shell and being chemically unreactive.