Let's have primary, secondary and terciary carbo radical/cation. C(./+)H2R C(./+)HR2 C(./+)R3 1) The central carbon has lesser shielded nucleus (one electron from a group is missing or both its and groups's electrons are missing). So the nucleus electrostatic force increases. 2) Primary carbo radical/cation attracts electrons from two hydrogens and from one carbon. Also the two hydrogens gets larger effective charge, but this effect on carbon (on its hydrogens) is weaker (btw. why is it weaker?). In primary carbo the hydrogens have the largest effective charge and so that is the reason of its unstablility. 3) Terciary carbo radical/cation attracts electrons from only three carbons, and again the inductive effect on their hydrogens is weaker, so the hydrogens there have the slightest effective charge and so that is the reason of terciary carbo relative stability. Please tell me whether this thesis is true (if the carbo stability is the reason of the degree of its hydrogens effective charge). I'm interested only in the inductive effect (not in hyperconjugation as the other stabilising factor).