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Tantalum
73Ta
Nb ↑ Ta ↓ Db Periodic table hafnium ← tantalum → tungsten
Panagway
gray blue
Kinatibuk-ang mga kinaiya
Ngalan, simbolo, kaiphan	tantalum, Ta, 73
Paglitok	/ˈtæntələm/ [[Help:Pronunciation respelling key|Plantilya:Smallcaps all-təl-əm]]; previously /tænˈtæliəm/ [[Help:Pronunciation respelling key|tan-Plantilya:Smallcaps all-ee-əm]]
Kategoriyang elemento	puthaw nga transisyon
Group, period, block	5, 6, d
Gibug-aton sa atomo	180.94788
Kontorno sa elektron	[Xe] 4f14 5d3 6s2 2, 8, 18, 32, 11, 2
History
Pagkadiskobre	Anders Gustaf Ekeberg (1802)
Recognized as a distinct element by	Heinrich Rose (1844)
Physical properties
Phase	magahi
Density (near r.t.)	16.69 g·cm−3
Liquid density at m.p.	15 g·cm−3
Melting point	3290 K, 3017 °C, 5463 °F
Boiling point	5731 K, 5458 °C, 9856 °F
Heat of fusion	36.57 kJ·mol−1
Heat of vaporization	732.8 kJ·mol−1
Molar heat capacity	25.36 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 3297 3597 3957 4395 4939 5634
Atomic properties
Oxidation states	5, 4, 3, 2, -1 (mildly acidic oxide)
Electronegativity	1.5 (Pauling scale)
Ionization energies	1st: 761 kJ·mol−1
	2nd: 1500 kJ·mol−1
Atomic radius	146 pm
Covalent radius	170±8 pm
Miscellanea
Crystal structure	body-centered cubic[1] α-Ta
	tetragonal[1] β-Ta
Magnetic ordering	paramagnetic[2]
Electrical resistivity	(20 °C) 131 nΩ·m
Thermal conductivity	57.5 W·m−1·K−1
Thermal expansion	(25 °C) 6.3 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 3400 m·s−1
Young's modulus	186 GPa
Shear modulus	69 GPa
Bulk modulus	200 GPa
Poisson ratio	0.34
Mohs hardness	6.5
Vickers hardness	873 MPa
Brinell hardness	800 MPa
CAS registry number	7440-25-7
Most stable isotopes
Main article: Isotopes of tantalum
iso NA half-life DM DE (MeV) DP 177Ta syn 56.56 h ε 1.166 177Hf 178Ta syn 2.36 h ε 1.910 178Hf 179Ta syn 1.82 y ε 0.110 179Hf 180Ta syn 8.125 h ε 0.854 180Hf β− 0.708 180W Plantilya:Elementbox isotopes decay4 181Ta 99.988% 181Ta is stable with 108 neutrons 182Ta syn 114.43 d β− 1.814 182W 183Ta syn 5.1 d β− 1.070 183W
· r

Ang tantalyo (Iningles tantalum) mao ang elementong kimiko sa talaang peryodiko nga may simbolo nga Ta ug kaiphan nga atomik 73. Ang tantalyo mao ang puthaw nga transisyon.

1. ↑ ^{1.0 1.1} Plantilya:Cite doi
2. ↑ Magnetic susceptibility of the elements and inorganic compounds, in Handbook of Chemistry and Physics 81st edition, CRC press.