Jern

26
Fe
Gruppe
8
Periode
4
Blok
d
Protons
Electrons
Neutrons
26
26
30
General Properties
Atomnummer
26
Atommasse
55,845
Mass Number
56
Kategori
Overgangsmetaller
Farve
Grå
Radioactive
Nej
From the Latin word ferrum
Krystalstruktur
Rumcentreret Kubisk
History
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.
Elektroner i hver skal
2, 8, 14, 2
Elektronkonfiguration
[Ar] 3d6 4s2
Fe
The color of blood is due to the hemoglobin, an iron-containing protein
Physical Properties
Tilstandsform
Fast stof
Massefylde
7,874 g/cm3
Smeltepunkt
1811,15 K | 1538 °C | 2800,4 °F
Kogepunkt
3134,15 K | 2861 °C | 5181,8 °F
Smeltevarme
13,8 kJ/mol
Fordampningsvarme
347 kJ/mol
Varmefylde
0,449 J/g·K
Abundance in Earth's crust
6,3%
Abundance in Universe
0,11%
Pure
Billede akkrediteringer: 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
Atomic Properties
Atomradius
126 pm
Kovalent radius
132 pm
Elektronegativitet
1,83 (Paulings skala)
Ionization Potential
7,9024 eV
Atomic Volume
7,1 cm3/mol
Varmeledningsevne
0,802 W/cm·K
Oxidationstrin
-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
Isotoper
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