Kalisiyumu cyangwa calcium ya calcium ni icyuma-cyera.Ikoreshwa cyane cyane nka deoxidizing, decarburizing, na desulfurizing agent mubyuma bivangwa nibyuma bidasanzwe.Ikoreshwa kandi nkigikoresho cyo kugabanya ibintu byinshi-byera bidasanzwe byisi.
Kalisiyumu ni icyuma cyera-cyera, gikomeye kandi kiremereye kuruta lithium, sodium, na potasiyumu;gushonga kuri 815 ° C.Imiti ya calcium ya calcium ikora cyane.Mu kirere, calcium izahinduka okiside vuba, igapfundikira igice cya firime ya oxyde.Iyo ashyushye, calcium irashya, itera urumuri rwiza rw'amatafari-umutuku.Igikorwa cya calcium n'amazi akonje biratinda, kandi imiti yimiti ikaze izabera mumazi ashyushye, irekura hydrogène (lithium, sodium, na potasiyumu nayo izagira imiti ikaze ndetse no mumazi akonje).Kalisiyumu nayo yoroshye guhuza na halogene, sulfure, azote nibindi.