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chromium (Cr, 7S3 in ground state)
subject			fact

chromium	has symbol Cr
	has lethal intake 70 mg kg-1 metal taken oraly in humans
	has reserves 1 × 109 tonnes
	has main mining area Turkey, South Africa, Zimbabwe, Russia, Philipipines
	has mineral chromite, crocoite
	has neutron scattering length 0.3635 × 10-12 cm
	has electron affinity 64.3 kJ mol-1 from Cr to Cr-
	has toxic intake 200 mg
	has poisson's ratio 0.21 GPa
	has bulk modulus 160.2 GPa
	has rigidity modulus 115.3 GPa
	has young's modulus 279 GPa
	has mass magnetic susceptibility +4.45 × 10-8 kg-1 m3 for solid
	has electrical resistivity 12.7 × 10-8 Ω m at 293 K
	has thermal neutron capture cross section 3.1 barns
	has longest lived isotope chromium 52
	has isotope mass range 45 to 57
	has number of isotopes 13 including nuclear isomers
	has pronunciation kroh-mi-uhm
	has name origin chroma = colour from Greek
	has discovery location Paris, France
	has abundance 5.13 × 105 in Sun relative to H = 1 × 1012
	has abundance 100 p.p.m. in Earth's crust
	has abundance 1.8 × 10-4 p.p.m. in Atlantic surface seawater
	has abundance 2.3 × 10-4 p.p.m. in deep Atlantic seawater
	has abundance 1.5 × 10-4 p.p.m. in Pacific surface seawater
	has abundance 2.5 × 10-4 p.p.m. in deep Pacific seawater
	has specimen chips, chunks, crystallites or powder. Safe.
	has world production 20000 tonnes year-1 for chromium metal
	has world production 9.6 × 106 tonnes year-1 for chromite ore
	has chief source chromite
	has mass absorption coefficient 260 cm2 g-1 for CuKalpha X-ray diffraction
	has mass absorption coefficient 31.1 cm2 g-1 for MoKalpha X-ray diffraction
	has space group Im3m
	has crystal cell dimension a = 288.46 pm
	has crystal type b.c.c.
	has atomic emission line 357.869 nm for Cr I (used in atom absorption spectrometry)
	has atomic emission line 359.349 nm for Cr I
	has atomic emission line 360.533 nm for Cr I
	has atomic emission line 425.435 nm for Cr I (strong)
	has atomic emission line 427.480 nm for Cr I
	has atomic emission line 428.972 nm for Cr I
	has atomic emission line 520.844 nm for Cr I
	has term symbol 7S3 in ground state
	has electron configuration [Ar]3d54s1 in ground state
	has mass of element in person 14 mg for a 70 kg average person
	has daily dietary intake 0.01 - 1.2 mg
	has level in humans 0.006 - 0.11 mg dm-3 in blood
	has level in humans 0.1 - 0.33 p.p.m. in bone
	has level in humans 0.02 - 3.3 p.p.m. in liver
	has level in humans 0.024 - 0.84 p.p.m. in muscle
	has hazard poison by ingestion, suspected carcinogen, chromates are corrosive to tissue
	has biological role essential to some species, including humans, stimulates metabolism
	has linear expansion coefficient 6.2 × 10-6 K-1
	has thermal conductivity 93.7 W m-1 K-1 at 300 K
	has molar volume 7.23 cm3
	has heat capacity 23.35 J K-1 mol-1 for solid at constant pressure 0.1 MPa at 298.15 K
	has heat capacity 20.79 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K
	has heat of vaporization 348.78 kJ mol-1
	has heat of fusion 15.3 kJ mol-1
	has boiling point 2945 K
	has melting point 2130 ± 20 K
	has electronegativity 1.66 Pauling
	has relative atomic mass 51.9961 in units of 12C = 12.000
has ionic radii 56 pm for Cr4+
has ionic radii 64 pm for Cr3+
has ionic radii 84 pm for Cr2+
has atomic radii 125 pm
has number of protons 24
has registry number 7440-47-3 for Chemical Abstracts System database
has density 7190 kg m-3 for solid at 293 K
has density 6460 kg m-3 for liquid at 2130 K melting point
has ocean oxidation state VI
has ocean residence time 10000 years
has atomic number 24
reacts with HCL and H2SO4 by disolving
has discovery date 1780
has discoverer Nicholas Louis Vauquelin
has uses alloys, plating and metal ceramics
has image
has definition hard, blue-white metal which resists oxidation in air, can be polished to a high shine
is a kind of transition metal
is a kind of chalcophile element
is a kind of recycled oceanic element
recycled oceanic element	has ocean concentration increasing with depth
chalcophile element	has occurrence in sulfide minerals
column grouped element	has group a column number in the table of the elements
element	is a part of Universe
	has synonym atom
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of chromium :

• chromium 48 (8 facts) (⁴⁸Cr)
• chromium 49 (11 facts) (⁴⁹Cr)
• chromium 50 (8 facts) (⁵⁰Cr)
• chromium 51 (12 facts) (⁵¹Cr)
• chromium 52 (8 facts) (⁵²Cr)
• chromium 53 (15 facts) (⁵³Cr)
• chromium 54 (8 facts) (⁵⁴Cr)
• chromium 55 (9 facts) (⁵⁵Cr)
• chromium 56 (9 facts) (⁵⁶Cr)

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