Which phenomenon causes the reduced reactivity of a noble gas like helium?

💡 Explanation

When noble gas electron shells are filled, the octet rule dictates stable electron configuration because all available atomic orbitals are either filled, which leads to high stability and little inclination to bond. Therefore the filled orbitals cause low reactivity; rather than high ionization, electronegativity, or large radius, which are related to reactivity in different contexts.

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