Airn

Airn is a chemical element in the periodic cairt that haes the symbol Fe (L.: Ferrum) an atomic nummer 26. Airn is a group 8 an period 4 Metal. Airn is kent for bein the last element made bi stellar nucleosynthesis, an sicweys the maist wechtie element that disna require a supernova or seemilar catacleesmic event for tae be formed. It is, tharefore, the maist rowthie wechtie metal in the universe.

Airn, ₂₆Fe

Airn
Appearance	lustrous metallic wi a grayish tinge
Standard atomic weight Ar, std(Fe)	7001558450000000000♠55.845(2)[1]
Airn in the periodic cairt
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 Airn Cobalt Nickel Capper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Siller (element) 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 Gowd Mercur (element) Thallium Leid (element) 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 Ununtrium Flerovium Ununpentium Livermorium Ununseptium Ununoctium - ↑ Fe ↓ Ru manganese ← airn → cobalt
Atomic nummer (Z)	26
Group	group 8
Period	period 4
Block	d-block
Element category	Transeetion metal
Electron confeeguration	[Ar] 3d6 4s2
Electrons per shell	2, 8, 14, 2
Pheesical properties
Phase at STP	solit
Meltin pynt	1811 K ​(1538 °C, ​2800 °F)
Bylin pynt	3134 K ​(2862 °C, ​5182 °F)
Density (near r.t.)	7.874 g/cm3
when liquid (at m.p.)	6.98 g/cm3
Heat o fusion	13.81 kJ/mol
Heat o vapourisation	340 kJ/mol
Molar heat capacity	25.10 J/(mol·K)
Vapour pressur P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1728 1890 2091 2346 2679 3132
Atomic properties
Oxidation states	−4, −2, −1, 0, +1,[2] +2, +3, +4, +5,[3] +6, +7[4] (an amphoteric oxide)
Electronegativity	Pauling scale: 1.83
Ionisation energies	(more)
Atomic radius	empirical: 126 pm
Covalent radius	132±3 (law spin), 152±6 (heich spin) pm
Colour lines in a spectral range Spectral lines o airn
Ither properties
Naitural occurrence	primordial
Creestal structur	​body-centred cubic (bcc) a=286.65 pm;
Speed o soond thin rod	(electrolytic) 5120 m/s (at r.t.)
Thermal expansion	11.8 µm/(m·K) (at 25 °C)
Thermal conductivity	80.4 W/(m·K)
Electrical resistivity	96.1 n Ω·m (at 20 °C)
Magnetic orderin	ferromagnetic
Young's modulus	211 GPa
Shear modulus	82 GPa
Bulk modulus	170 GPa
Poisson ratio	0.29
Mohs haurdness	4
Vickers haurdness	608 MPa
Brinell haurdness	490 MPa
CAS Nummer	7439-89-6
History
Diskivery	afore 5000 BC
Main isotopes o airn
Iso­tope Abun­dance Hauf-life (t1/2) Decay mode Pro­duct 54Fe 5.8% >3.1×1022 y (β+β+) 54Cr 55Fe syn 2.73 y ε 55Mn 56Fe 91.72% stable 57Fe 2.2% stable 58Fe 0.28% stable 59Fe syn 44.503 d β− 59Co 60Fe syn 2.6×106 y β− 60Co
Decay modes in parentheses are predictit, but hae nae yet been observed
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