CAS Number7440-17-7
PubChem CID5357696
Atomic Radius248
Atomic Volume55.9
Atomic Weight85.468
Boiling Point688
Bulk Modulus
CategoryAlkali metals
Crystal StructureBody Centered Cubic
Covalent Radius220
Electrical Resistivity
Electron Configuration[Kr] 5s1
Electrons per shell2, 8, 18, 8, 1
Heat of Fusion2.19
Heat of Vaporization72
Ionization Potential4.177
Magnetic Ordering
Magnetic Susceptibility
Mass Number37
Melting Point39.31
Atomic Number85
Oxidation States-1, 1
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.363
Thermal Conductivity0.582
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.006%
Abundance in Universe1×10-6%
Rb Rubidium 37 85.4678 1 5 s 37 38.9 686.0 [Kr] 5s1 2 8 18 8 1 1.53 0.006% Silver Cubic: Body centered 0.8 0.706 {"1":"403.0","2":"2633","3":"3860","4":"5080","5":"6850","6":"8140","7":"9570","8":"13120","9":"14500","10":"26740"} 409 46.9 211 1 2.48 55.9 2.34 69.2 0.363 58.2 0 Solid, Conductor, AlkaliMetal, Metal, Stable, Natural roo-BID-i-em Soft, silvery-white, highly reactive metal. Used as a catalyst, photocells, and vacuum and cathode-ray tubes. Occurs abundantly, but so widespread that production is limited. Usually obtained from lithium production. 0XLGopBovoI Rubidium
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. From the Latin word ferrum 37 1861 Robert Bunsen, Gustav Kirchhoff Germany From the Latin word "rubidius" meaning "dark red" or "deepest red"

Isotopes of Iron

Standard Atomic Weight


Stable Isotopes

85Rb 87Rb

Unstable Isotopes

71Rb 72Rb 73Rb 74Rb 75Rb 76Rb 77Rb 78Rb 79Rb 80Rb 81Rb 82Rb 83Rb 84Rb 86Rb 88Rb 89Rb 90Rb 91Rb 92Rb 93Rb 94Rb 95Rb 96Rb 97Rb 98Rb 99Rb 100Rb 101Rb 102Rb

Iron is considered to be non-toxic
The color of blood is due to the hemoglobin, an iron-containing protein
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.