The coefficient of linear expansion of tantalum is 6.5 × 10^-6K-1 between 0 ~ 100 ℃, the critical temperature of superconductivity is 4.38K, and the thermal neutron absorption cross section of atom is 21.3. 

Tantalum is one of the most stable metals of chemical properties at temperatures below 150 °C. And tantalum can react with only fluoride, hydrofluoric acid, fluoride-containing acidic solution and sulfur trioxide. Reacted at room temperature with a concentrated base solution and dissolved in a molten base. The dense tantalum begins to oxidize slightly at 200 ° C and is significantly oxidized at 280 °C. Tantalum has a variety of oxides, the most stable is tantalum pentoxide (Ta2O5).

Tantalum and hydrogen above the formation of brittle solid solution and metal hydride such as: Ta2H, TaH, TaH2, TaH3. In the vacuum of 800 ~ 1200 ℃, hydrogen from tantalum tantalum and plasticity. Tantalum and nitrogen began to react at about 300 °C to form solid solution and nitrogen compounds; at higher than 2000 °C and high vacuum, the absorbed nitrogen was precipitated from tantalum. Tantalum and carbon are present at higher than 2800 °C in three phases: carbon-tantalum solid solution, low-cost carbides and high-priced carbides. Tantalum can react with fluorine at room temperature and react with other halogens at temperatures above 250 °C to form halides.