CAS Number7440-24-6
PubChem CID5359327
Atomic Radius215
Atomic Volume33.7
Atomic Weight87.62
Boiling Point1,382
Bulk Modulus
CategoryAlkaline earth metals
Crystal StructureFace Centered Cubic
Covalent Radius195
Electrical Resistivity
Electron Configuration[Kr] 5s2
Electrons per shell2, 8, 18, 8, 2
Heat of Fusion8
Heat of Vaporization137
Ionization Potential5.695
Magnetic Ordering
Magnetic Susceptibility
Mass Number38
Melting Point777
Atomic Number88
Oxidation States1, 2
Poisson Ratio
Shear Modulus
Specific Heat Capacity0.301
Thermal Conductivity0.353
Van der Waals radius
Young's Modulus
Abundance in Earth's crust0.036%
Abundance in Universe4×10-6%
Sr Strontium 38 87.62 2 5 s 38 769.0 1384.0 [Kr] 5s2 2 8 18 8 2 2.54 0.036% Silver Cubic: Face centered 1.0 0.963 {"1":"549.5","2":"1064.2","3":"4138","4":"5500","5":"6910","6":"8760","7":"10230","8":"11800","9":"15600","10":"17100","11":"31270"} 550 5.03 192 2 2.15 33.7 8.2 136.9 0.3 35.3 0 Solid, Paramagnetic, Conductor, AlkalineEarthMetal, Metal, Stable, Natural STRON-she-em Soft, malleable, silvery-yellow metal. Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions. Found in minerals celestite and strontianite. f7NiPdD1Xx0 Strontium
Cobalt compounds have been used for centuries to impart a rich blue color to glass, glazes and ceramics.

The element was first isolated by Swedish chemist George Brandt in 1735.

He showed it was the presence of the element cobalt that caused the blue color in glass, not bismuth as previously thought. From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine 38 1790 Adair Crawford Scotland Named after the village of "Strontian" in Scotland

Isotopes of Cobalt

Standard Atomic Weight


Stable Isotopes

84Sr 86Sr 87Sr 88Sr

Unstable Isotopes

73Sr 74Sr 75Sr 76Sr 77Sr 78Sr 79Sr 80Sr 81Sr 82Sr 83Sr 85Sr 89Sr 90Sr 91Sr 92Sr 93Sr 94Sr 95Sr 96Sr 97Sr 98Sr 99Sr 100Sr 101Sr 102Sr 103Sr 104Sr 105Sr

Cobalt and its compounds are considered to be slightly toxic
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys.

Cobalt is widely used in batteries and in electroplating.

Radioactive 60Co is used in the treatment of cancer.

A solution of the chloride is used as a sympathetic ink.