Tantalyo

Tantalum
73Ta
Nb ↑ Ta ↓ Db Periodic table hafnium ← tantalum → tungsten
Appearance
gray blue
General properties
Name, simbolo, kaiphan	tantalum, Ta, 73
Pronunciation	Plantilya:IPAc-en Plantilya:Respell; previously Plantilya:IPAc-en Plantilya:Respell
Element category	puthaw nga transisyon
Group, period, block	5, 6, d
Standard atomic weight	180.94788
Electron configuration	[Xe] 4f14 5d3 6s2 2, 8, 18, 32, 11, 2
History
Discovery	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 α-Ta
	tetragonal β-Ta
Magnetic ordering	paramagnetic
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 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

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.

Galeriya sa hulagway

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