Iron

Images

Image

Attribution: Alchemist-hp

Animated Iron

History

Latin ferrum. Iron was used prehistorically:

Sources

Iron is a relatively abundant element in the universe. It is found in the sun and many types of stars in considerable quantity. Its nuclei are very stable. Iron is a principal component of a meteorite class known as siderites and is a minor constituent of the other two meteorite classes. The core of the earth -- 2150 miles in radius -- is thought to be largely composed of iron with about 10 percent occluded hydrogen. The metal is the fourth most abundant element, by weight that makes up the crust of the earth.

The most common ore is hematite, which is frequently seen as black sands along beaches and banks of streams.

Uses

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

Taconite is becoming increasingly important as a commercial ore. The pure metal is not often encountered in commerce, but is usually alloyed with carbon or other metals.

Isotopes

Common iron is a mixture of four isotopes. Ten other isotopes are known to exist.

General Info

AtomicNumber
26
Symbol
Fe
Name
Iron

Atomic Info

Appearance
AtomicWeight
55.845(2)
Color
E06633
ElectronicConfiguration
[Ar] 3d6 4s2
ElectronegativityInPauling
1.83
AtomicRadiusInPM
125
IonRadiusInPM
78 (+2*)
VanDerWaalsRadiusInPM
IEinKJmol
763
EAinKJmol
-16
OxidationStates
-2, -1, 1, 2, 3, 4, 5, 6
StandardState
solid
BondingType
metallic
MeltingPoint
1811
BoilingPoint
3134
Density
7.87
State
Transition metal
DiscoveredYear
Ancient