Titanium

Titanium, ₂₂Ti

Titanium
Pronunciation	/taɪˈteɪniəm/ (ty-TAY-nee-əm) /tɪˈteɪniəm/ (tih-TAY-nee-əm)
Appearance	silvery grey-white metallic
Standard atomic weight Ar°(Ti)
	47.867(1)
Titanium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ Ti ↓ Zr scandium ← titanium → vanadium
Atomic number (Z)	22
Group	group 4
Period	period 4
Block	d-block
Electron configuration	[Ar] 3d2 4s2
Electrons per shell	2, 8, 10, 2
Physical properties
Phase at STP	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)
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 states	−2, −1, 0, +1, +2, +3, +4 (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 (more)
Atomic radius	empirical: 147 pm
Covalent radius	160±8 pm
Spectral lines of titanium
Other properties
Natural occurrence	primordial
Crystal structure	​hexagonal close-packed (hcp)
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
Molar magnetic susceptibility	+153.0×10−6 cm3/mol (293 K)
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
History
Discovery	William Gregor (1791)
First isolation	Jöns Jakob Berzelius (1825)
Named by	Martin Heinrich Klaproth (1795)
Isotopes of titanium v e
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 44Ti synth 59.1 y ε 44Sc 46Ti 8.25% stable 47Ti 7.44% stable 48Ti 73.7% stable 49Ti 5.41% stable 50Ti 5.18% stable
Category: Titanium view talk edit | references

Titanium is a very strong metal that is used in special applications. The most common isotope has 26 neutrons. Titanium was discovered in 1791 by William Gregor. It is chemical element number 22 on the periodic table. Its symbol is Ti. It has 22 electrons and 22 protons. Its name comes from the name of the strong Greek gods called Titans.

Titanium can combine with other chemicals to make different materials. When titanium mixes with oxygen from the air, it forms titanium dioxide (TiO₂) or titania, which forms a hard passivation layer around the metal that prevents corrosion. Titanium dioxide is a white pigment that is often used to make things less transparent, brighter, or rougher - because it does not react with chemicals inside the human body, it is safe to use in foods and other applications, like toothpaste.

Titanium alloys are used in aerospace engineering to make very strong and light parts of aeroplanes. These alloys can replace steel because they are almost as strong as steel but much lighter. They are also much stronger than aluminium alloys, but only a little heavier, meaning that titanium parts can be thinner and lighter, while still withstanding the same forces. It does not corrode in most conditions, even when exposed to sea water or chlorine. However, it can burn at high temperatures, and like many metal powders, titanium dust is extremely flammable.

More than a third of the world's titanium in 2021 was produced by a Russian firm, VSMPO-AVISMA, which has factories in many countries including one in Redditch, England.

References

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