Jern

26
Fe
Gruppe
8
Periode
4
Blokk
d
Protons
Electrons
Neutrons
26
26
30
Generelle eigenskapar
Atomnummer
26
Atommasse
55,845
Mass Number
56
Kategori
Transisjonsmetall
Farge
Grå
Radioactive
Nei
From the Latin word ferrum
Krystallstruktur
Body Centered Cubic
Historie
The first iron used by humans is likely to have come from meteorites.

The oldest known iron objects used by humans are some beads of meteoric iron, made in Egypt in about 4000 BC.

The discovery of smelting around 3000 BC led to the start of the iron age around 1200 BC and the prominent use of iron for tools and weapons.
Elektron per energinivå
2, 8, 14, 2
Elektronkonfigurasjon
[Ar] 3d6 4s2
Fe
The color of blood is due to the hemoglobin, an iron-containing protein
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
7,874 g/cm3
Smeltepunkt
1811,15 K | 1538 °C | 2800,4 °F
Kokepunkt
3134,15 K | 2861 °C | 5181,8 °F
Smeltevarme
13,8 kJ/mol
Fordampingsvarme
347 kJ/mol
Spesifikk varmekapasitet
0,449 J/g·K
Abundance in Earth's crust
6,3%
Abundance in Universe
0,11%
Pure
Image Credits: Wikimedia Commons (Alchemist-hp)
Pure iron chips, electrolytically refined, as well as a high purity iron cube for comparison
CAS Number
7439-89-6
PubChem CID Number
23925
Atom eigenskapar
Atomradius
126 pm
Kovalent radius
132 pm
Elektronegativitet
1,83 (Paulings skala)
Ioniseringspotensial
7,9024 eV
Molart volum
7,1 cm3/mol
Termisk konduktivitet
0,802 W/cm·K
Oksidasjonstrinn
-2, -1, 1, 2, 3, 4, 5, 6, 7, 8
Applications
Iron is used to manufacture steel and other alloys important in construction and manufacturing.

Iron is a vital constituent of plant and animal life and works as an oxygen carrier in hemoglobin.

Iron oxide mixed with aluminum powder can be ignited to create a thermite reaction, used in welding and purifying ores.
Iron is considered to be non-toxic
Isotopes
Stable Isotopes
54Fe, 56Fe, 57Fe, 58Fe
Unstable Isotopes
45Fe, 46Fe, 47Fe, 48Fe, 49Fe, 50Fe, 51Fe, 52Fe, 53Fe, 55Fe, 59Fe, 60Fe, 61Fe, 62Fe, 63Fe, 64Fe, 65Fe, 66Fe, 67Fe, 68Fe, 69Fe, 70Fe, 71Fe, 72Fe