Noble gases are unreactive mainly because they
Answer and explanation
Correct answer: B. have completely filled outer shells
- Step 1: Chemical reactivity is governed by an atom's drive to reach an energetically stable outer electron shell configuration.
- Step 2: Noble gases (Group 18) possess fully occupied valence shells (, or for helium), representing complete octets/duets.
- Step 3: Because their valence shells are completely filled, they have very high ionization energies and negligible electron affinity, making them exceptionally stable and chemically unreactive under normal conditions.
Answer
have completely filled outer shells.
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