ʻO Tantalum kahi mea kemika me ka hōʻailona Ta a me ka helu atomika 73. Ma mua i kapa ʻia ʻo tantalium, ua loaʻa mai kona inoa mai Tantalus, he mea ʻino mai ka moʻolelo Helene.ʻO ka Tantalum kahi metala hoʻololi kakaʻikahi, paʻakikī, ʻulaʻula-hina, ʻālohilohi i kū i ka corrosion.He ʻāpana ia o ka pūʻulu metala refractory, i hoʻohana nui ʻia e like me nā mea liʻiliʻi i nā alloys.ʻO ka inertness kemika o ka tantalum e lilo ia i mea waiwai no nā mea hana lab a me kahi pani no ka platinum.ʻO kāna hoʻohana nui i kēia lā i nā capacitors tantalum i nā lako uila e like me nā kelepona paʻa, nā mea pāʻani DVD, nā ʻōnaehana wikiō a me nā kamepiula.ʻO ka Tantalum, me ka niobium like me ke kemika, loaʻa i loko o nā hui mineral tantalite, columbite a me coltan (he hui o columbite a me tantalite, ʻaʻole naʻe i ʻike ʻia he ʻano mineral kaʻawale).Manaʻo ʻia ʻo Tantalum he ʻenehana koʻikoʻi.

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ʻO ka Tantalum he pōʻeleʻele (uliuli-hina), ʻoʻoleʻa, ductile, paʻakikī loa, hana maʻalahi, a me ka lawe ʻana i ka wela a me ka uila.Kaulana ʻia ka metala no kona kū kūʻē ʻana i ka ʻinoʻino e nā waikawa;ʻOiaʻiʻo, ma nā mahana ma lalo o 150 °C ʻaneʻane pale ʻia ka tantalum i ka hoʻouka ʻana e ka aqua regia maʻamau.Hiki ke hoʻoheheʻe ʻia me ka waika hydrofluoric a i ʻole nā ​​​​mea ʻawaʻawa i loaʻa i ka fluoride ion a me ka sulfur trioxide, a me ka hopena o ka potassium hydroxide.ʻOi aku ka helu heheʻe kiʻekiʻe o Tantalum o 3017 °C (kahi paila 5458 °C) ma waena o nā mea wale nō e ka tungsten, rhenium a me ka osmium no nā metala, a me ke kalapona.

Aia ʻo Tantalum i ʻelua ʻāpana crystalline, alpha a me beta.ʻO ka alpha alpha he ductile a palupalu;he kino-kokoko o ke kino (hui hui Im3m, lattice mau a = 0.33058 nm), Knoop paakiki 200–400 HN a me ka uila resistivity 15–60 µΩ⋅cm.He paʻakikī a palupalu ka pae beta;he tetragonal kona symmetry aniani (hui P42/mnm, a = 1.0194 nm, c = 0.5313 nm), ʻo 1000–1300 HN ka paʻakikī Knoop a ʻoi aku ka kiʻekiʻe o ka resistivity uila ma 170-210 µΩ⋅cm.He metastable ka māhele beta a hoʻololi i ka māhele alpha ma ka hoʻomehana ʻana i 750–775 °C.ʻO ka tantalum nui ʻaneʻane holoʻokoʻa alpha phase, a ʻo ka māhele beta ma ke ʻano he kiʻiʻoniʻoni lahilahi i loaʻa ma ka magnetron sputtering, ka hoʻoheheʻe ʻana i ka mahu a i ʻole ka hoʻoheheʻe electrochemical mai kahi hopena paʻakai hoʻoheheʻe eutectic.