I-Kalzium uhlelo olukhombisa uhlu lwezakhi ngezikhathi ezithile. Ungasebenzisa i-kalzium ukucinga imininingwane mayelana nezinto noma ukufunda amaqiniso ngethebula lesikhathi. Inikeza ngesibukezo sedatha ebalulekile (efana namaphoyinti ancibilikayo, ukungalingani kwe-elektroni, ukumiswa kwe-elektroni, i-radii, i-Ionisation Energy) Inamathuluzi okubona ngeso lengqondo imigqa yokubuka yento ngayinye, umshini wokubala we-molecular, umhleli we-molecule we-3D, kanye ne-solver ye-equation yezinkinga ze-stoichiometric.