Tantalyo

Gikan sa Wikipedia, ang gawasnong ensiklopedya
Tantalum
73Ta
Nb

Ta

Db
hafniumtantalumtungsten
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 56, d
Standard atomic weight 180.94788
Electron configuration [Xe] 4f14 5d3 6s2
2, 8, 18, 32, 11, 2
Electron shells of tantalum (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[1]
Tantalum has a body-centered cubic crystal structure

α-Ta
tetragonal[1]
Tantalum has a tetragonal crystal structure

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
t  h  u
· 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.

Ang mga gi basihan niini[usba | edit source]

  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.


Galeriya sa hulagway[usba | edit source]