Titanium, 00Ti
A bar of metal formed out of shiny metallic titanium crystals that appear to have grown from the center outwards
Titanium
Pronunciation
Appearancesilvery grey-white metallic
Standard atomic weight Ar°(Ti)
Titanium in the periodic table
Groupgroup 4
Periodperiod 4
Block  d-block
Electron configuration[Ar] 3d2 4s2
Electrons per shell2, 8, 10, 2
Physical properties
Phase at STPsolid
Melting point1941 K (1668 °C, 3034 °F)
Boiling point3560 K (3287 °C, 5949 °F)
Density (near r.t.)4.506 g/cm3
when liquid (at m.p.)4.11 g/cm3
Heat of fusion14.15 kJ/mol
Heat of vaporization425 kJ/mol
Molar heat capacity25.060 J/(mol·K)
Specific heat capacity523.534 J/(kg·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1982 2171 (2403) 2692 3064 3558
Atomic properties
Oxidation statescommon: +4
−2,[4] −1,[5] 0,[6] +1,[7] +2,[5] +3[5]
ElectronegativityPauling scale: 1.54
Ionization energies
  • 1st: 658.8 kJ/mol
  • 2nd: 1309.8 kJ/mol
  • 3rd: 2652.5 kJ/mol
  • (more)
Atomic radiusempirical: 147 pm
Covalent radius160±8 pm
Color lines in a spectral range
Spectral lines of titanium
Other properties
Natural occurrenceprimordial
Crystal structure hexagonal close-packed (hcp)
Hexagonal close packed crystal structure for titanium
Thermal expansion8.6 µm/(m⋅K) (at 25 °C)
Thermal conductivity21.9 W/(m⋅K)
Electrical resistivity420 nΩ⋅m (at 20 °C)
Magnetic orderingparamagnetic
Young's modulus116 GPa
Shear modulus44 GPa
Bulk modulus110 GPa
Speed of sound thin rod5,090 m/s (at r.t.)
Poisson ratio0.32
Mohs hardness6.0
Vickers hardness970 MPa
Brinell hardness716 MPa
CAS Number7440-32-6
History
Discovery1791
First isolationJöns Jakob Berzelius (1825)
Named byMartin Heinrich Klaproth (1795)
Isotopes of titanium
Main isotopes[8] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
44Ti synth 59.1 y ε 44Sc
45Ti synth 3.08 h β+ 45Sc
46Ti 8.25% stable
47Ti 7.44% stable
48Ti 73.7% stable
49Ti 5.41% stable
50Ti 5.18% stable
 Category: Titanium
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References

  1. "titanium". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2019-12-20.
  2. "Standard Atomic Weights: Titanium". CIAAW. 1993.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
  4. Ti(-2) is known in Ti(CO)2−6; see John E. Ellis (2006). "Adventures with Substances Containing Metals in Negative Oxidation States". Inorganic Chemistry. 45 (8): 3167–3186. doi:10.1021/ic052110i.
  5. 1 2 3 Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. doi:10.1016/C2009-0-30414-6. ISBN 978-0-08-037941-8.
  6. Jilek, Robert E.; Tripepi, Giovanna; Urnezius, Eugenijus; Brennessel, William W.; Young, Victor G. Jr.; Ellis, John E. (2007). "Zerovalent titanium–sulfur complexes. Novel dithiocarbamato derivatives of Ti(CO)6:[Ti(CO)4(S2CNR2)]". Chem. Commun. (25): 2639–2641. doi:10.1039/B700808B. PMID 17579764.
  7. Andersson, N.; et al. (2003). "Emission spectra of TiH and TiD near 938 nm". J. Chem. Phys. 118 (8): 10543. Bibcode:2003JChPh.118.3543A. doi:10.1063/1.1539848.
  8. Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3) 030001. doi:10.1088/1674-1137/abddae.