I-Tantalum (Ta) ne-niobium (Nb) yizinsimbi ezingandile ezinendawo yokuncibilika ephezulu (tantalum 2996 ℃, i-niobium 2468 ℃) nendawo yokubilisa ephezulu (tantalum 5427 ℃, niobium 5127 ℃). Ubuningi be-tantalum ngu-16.65 g / cm³; Ubuningi be-niobium ngu-8.57 g / cm³. Ukubukeka kufana nensimbi, ukhanya okumhlophe okumpunga, impuphu impunga emnyama, ene-sction, ukumelana nokugqwala, i-superconductivity, ukuqhutshwa kwe-unipolar namandla aphezulu ekushiseni okuphezulu.