These differ in their S-character between carbanions formed from cubane and cyclopropane, explaining the differing kinetic acidity of those molecules. These can form dative bonds, causing molecules with these to be Lewis base
These differ in their S-character between carbanions formed from cubane and cyclopropane, explaining the differing kinetic acidity of those molecules. These can form dative bonds, causing molecules with these to be Lewis bases, and N S Two examples can be inert, explaining the oxidation states found in certain heavy post-transition elements.  These cause the (*) hydrogen bonding observed in water, and VSEPR predicts that these will take up more space than a covalent bonds, leading to trigonal pyramidal and bent molecular geometries. For 10 points, name this group of two valence electrons not involved in molecular bonding.
These differ in their S-character between carbanions formed from cubane and cyclopropane, explaining the differing kinetic acidity of those molecules.
{Lone Pairs} [prompt on "non-bonding electrons" before giveaway]