Ii-Elements okanye amalungu zingadibana (ngoku-reactha) ukuze zenze ii-pure compounds (ezifana namanzi, iityuwa, ii-oxides, kunye nee-organic compounds). Kwiimeko ezininzi, ezi compounds zine-fixed composition kwane-structure zazo nee- properties. Ii-properties ze-compound zingahluka kakhulu kwii-elements ezenziwe kuzo. I-Sodium y-imetal etshayo xa ithe yabekwa emanzini ane- chlorine iba yi-gas eyityhefu. xa zithe zadibana kwenzeka i-sodium chloride (ityuwa) into ke leyo engenabungozi kwaye yinto esenokusetyenziswa luluntu mhlawumbi ekutyeni.