Obusannyalazo( electrons) mu kisosonkole eky’ebweeru w'obuziizi buyitibwa busannyalazo obw'ekiyayaano(valence electrons). Obusannyalazo obw'ekiyayaano (Valence electrons) bwe bulaga enkula n’ekikyusabuziba(chemical reactivity) eky'endagakintu era bwenyigira mu nkwasowazo ez'ekikyusabuziba(chemical bonding). Namba ez’ekirooma eziri waggulu wa buli kibinja ziraga namba y’obusannyalazo bw'ekiyayaano(valence electrons).