Category

Chromium

Catalogue

Atomic structure
Discovery
Source
Element USES
physical property
Chemical property
Geological data
Biology data

Atomic structure

Atomic radius/A: 1.85 atomic volume/cm3 / mol: 7.23 covalent radius/A: 1.18

Electronic configuration: 1 2 3 4 s2p6 s2 s2p6d5 s1 ion radius/A: 0.52 oxidation state: 6 h NMR

Discovery

In 1780, by Nicholas Louis Vauquelin (Paris, France) found and isolated.

Source

Nature has no the free state of chromium, the main mineral is Chromite {Chromite [Fe, Mg (CrO4)]}

Element USES

For making stainless steel, auto parts, tools, audio and video tapes, etc.

physical property

State: hard, brittle transition metal gray. Melting point (℃) : 1857 boiling point (℃) : 2672 density (g/cc, 300 K) : 7.19

Than hot/J/gK: 0.45 evaporation heat/KJ/mol: 344.3 melting hot/KJ/mol: 16.9

Conductive rate / 106 / cm: 0.0774 coefficient of thermal conductivity/W/cmK: 0.937

Geological data

Abundance retention time/year: 10 000

The sun (relative to the H = 1 x 1012) : 5.13 x 105 sea/P.P.M.

The earth's crust/P.P.M. : c. 100 Atlantic ocean surface: 1.8 x 10-4 Pacific surface: 1.5 x 10-4

Atmospheric/P.P.M. (volume) : the Atlantic ocean depths: 2.3 x 10-4 deep in the Pacific: 2.5 x 10-4

Biology data

The human body the content in liver/P.P.M. : 0.02-3.3

Organs: muscle/P.P.M. : 0.024-0.84

Blood/mg dm-3:0.006-0.11 days intake/mg: 0.01-1.2

Bone/P.P.M. : 0.1 0.33 (70 Kg) are total body/mg: 14

Detailed information

Chromium/Cr