Noble gases are unreactive mainly because they
Answer and explanation
Correct answer: B. have completely filled outer shells
- Step 1: Chemical reactivity is driven by the tendency of atoms to achieve an octet or stable closed-shell electronic configuration.
- Step 2: Noble gases possess completely filled valence electron shells (, or for helium).
- Step 3: Because of their high ionization energies and zero or negative electron affinities, they exhibit minimal chemical reactivity under standard conditions.
Answer
have completely filled outer shells.
Why not the others: Noble gases have very low boiling and melting points; helium and neon are lightweight gases; only radon and oganesson are radioactive.
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