Airn

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Airn
26Fe
-

Fe

Ru
manganeseairncobalt
Appearance
lustrous metallic wi a grayish tinge
A rough wedge of silvery metal

Spectral lines o iron
General properties
Name, seembol, nummer airn, Fe, 26
Pronunciation /ˈ.ərn/
Element category transeetion metal
Group, period, block 8, 4, d
Staundart atomic wicht 55.845(2)
Electron confeeguration [Ar] 3d6 4s2
2, 8, 14, 2
History
Discovery afore 5000 BC
Physical properties
Phase solid
Density (near r.t.) 7.874 g·cm−3
Liquid density at m.p. 6.98 g·cm−3
Meltin pynt 1811 K, 1538 °C, 2800 °F
Boilin pynt 3134 K, 2862 °C, 5182 °F
Heat o fusion 13.81 kJ·mol−1
Heat o vaporization 340 kJ·mol−1
Molar heat capacity 25.10 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1728 1890 2091 2346 2679 3132
Atomic properties
Oxidation states 6, 5,[1] 4, 3, 2, 1[2], -1, -2
(amphoteric oxide)
Electronegativity 1.83 (Pauling scale)
Ionization energies
(more)
1st: 762.5 kJ·mol−1
2nt: 1561.9 kJ·mol−1
3rd: 2957 kJ·mol−1
Atomic radius 126 pm
Covalent radius 132±3 (law spin), 152±6 (heich spin) pm
Miscellanea
Crystal structure body-centered cubic
Airn has a body-centered cubic crystal structure

a=286.65 pm;
face-centered cubic
Airn has a face-centered cubic crystal structure

between 1185–1667 K
Magnetic orderin ferromagnetic
{{{Curie pynt}}} K
Electrical resistivity (20 °C) 96.1 nΩ·m
Thermal conductivity 80.4 W·m−1·K−1
Thermal expansion (25 °C) 11.8 µm·m−1·K−1
Speed o soond (thin rod) (r.t.) (electrolytic)
5120 m·s−1
Young's modulus 211 GPa
Shear modulus 82 GPa
Bulk modulus 170 GPa
Poisson ratio 0.29
Mohs hairdness 4
Vickers hairdness 608 MPa
Brinell hairdness 490 MPa
CAS registry nummer 7439-89-6
Most stable isotopes
Main article: Isotopes o airn
iso NA hauf-life DM DE (MeV) DP
54Fe 5.8% >3.1×1022 y (β+β+) 0.6800 54Cr
55Fe syn 2.73 y ε 0.231 55Mn
56Fe 91.72% 56Fe is stable wi 30 neutrons
57Fe 2.2% 57Fe is stable wi 31 neutrons
58Fe 0.28% 58Fe is stable wi 32 neutrons
59Fe syn 44.503 d β 1.565 59Co
60Fe syn 2.6×106 y β 3.978 60Co
Decay modes in parentheses are predictit, but hae nae yet been observed
· r

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

References[eedit | eedit soorce]

  1. Demazeau, G.; Buffat, B.; Pouchard, M.; Hagenmuller, P. (1982). "Recent developments in the field of high oxidation states of transition elements in oxides stabilization of Six-coordinated Iron(V)". Zeitschrift für anorganische und allgemeine Chemie 491: 60. doi:10.1002/zaac.19824910109. 
  2. Ram, R. S. and Bernath, P. F. (2003). "Fourier transform emission spectroscopy of the g4Δ-a4Δ system of FeCl". Journal of Molecular Spectroscopy 221 (2): 261. Bibcode:2003JMoSp.221..261R. doi:10.1016/S0022-2852(03)00225-X.