Science / Chemistry / Inert Pair: Valence electrons in an s orbital penetrate to the nucleus better than electrons in p orbitals, and as a result they're more tightly bound to the nucleus and less able to participate in bond formation. A pair of such electrons is called an 'inert pair'. The inert pair effect explains why common ions of Pb are Pb4+ and Pb2+, and not just Pb4+ as we might expect from the octet rule.
Inert Noun Synonyms: inactive, unreactive, unresponsive, neutral
Inert Adjective Synonyms: sluggish, slow, torpid, dull, inactive, idle, indolent, lazy, slothful, leaden, slack, passive, supine, dormant, otiose, listless, languid or languorous
Pair Verb Synonyms: couple, twosome, two of a kind, set of two, matched set, duo, dyad, twins, double, doublet, brace, span, yoke, team, tandem
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