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Friday, June 17, 2016

Titanium chemical element

Titanium was discovered in 1791 by William Gregor
The chemical symbol for Titanium is Ti and its atomic number is 22.
We find it listed in the periodic table in Group 4 and period 4, and block d.
Titanium belongs to the family or chemical series of transition metals such as for example the Silver, the Bohrium, cadmium, ...
This element is stable.
Titanium was named after the greek Titans.


Titanium chemical element



Atomic number (Z) 22
Group, block group 4, d-block
Period: period 4
Element category: transition metal
Standard atomic weight (±) (Ar): 47.867(1)
Electron configuration: [Ar] 3d2 4s2
per shell: 2, 8, 10, 2

Physical properties
Phase: solid
Melting point: 1941 K (1668 °C, 3034 °F)
Boiling point: 3560 K (3287 °C, 5949 °F)
Density near r.t.: 4.506 g/cm3
when liquid, at m.p. 4.11 g/cm3
Heat of fusion 14.15 kJ/mol
Heat of vaporization: 425 kJ/mol
Molar heat capacity: 25.060 J/(mol•K)

Atomic properties
Oxidation states: 4, 3, 2, 1, −1, −2 (an amphoteric oxide)
Electronegativity: Pauling scale: 1.54
Ionization energies: 1st: 658.8 kJ/mol
2nd: 1309.8 kJ/mol
3rd: 2652.5 kJ/mol
Atomic radius empirical: 147 pm
Covalent radius: 160±8 pm

Crystal structure: hexagonal close-packed 
Speed of sound thin rod: 5090 m/s (at r.t.)
Thermal expansion: 8.6 µm/(m•K) (at 25 °C)
Thermal conductivity: 21.9 W/(m•K)
Electrical resistivity: 420 nΩ•m (at 20 °C)
Magnetic ordering: paramagnetic
Young's modulus: 116 GPa
Shear modulus : 44 GPa
Bulk modulus: 110 GPa
Poisson ratio: 0.32
Mohs hardness: 6.0
Vickers hardness: 830–3420 MPa
Brinell hardness: 716–2770 MPa
CAS Number: 7440-32-6