Template:Infobox chromium

क्रोमियम
24Cr
– ↑ Cr ↓ Mo Periodic table भ्यान्दियम ← क्रोमियम → म्याङ्गानिज
रुप
silvery metallic chromium crystals
साधारण गुण
नां, चिं, ल्या	क्रोमियम, Cr, 24
उच्चारण	/ˈkroʊmiəm/
धातुया वर्ग	transition metal
ग्रुप, पिरियद, ब्लक	6, 4, d
Standard atomic weight	51.9961(6)
Electron configuration	[Ar] 3d5 4s1 2, 8, 13, 1
History
Discovery	1797
First isolation	1798
Physical properties
Phase	solid
Density (near r.t.)	7.19 g·cm−3
Liquid density at m.p.	6.3 g·cm−3
Melting point	2180 K, 1907 °C, 3465 °F
Boiling point	2944 K, 2671 °C, 4840 °F
Heat of fusion	21.0 kJ·mol−1
Heat of vaporization	347 kJ·mol−1
Molar heat capacity	23.35 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 1656 1807 1991 2223 2530 2942
Atomic properties
Oxidation states	6, 5, 4, 3, 2, 1, −1, −2 ((depending on the oxidation state, an acidic, basic, or amphoteric oxide))
Electronegativity	1.66 (Pauling scale)
Ionization energies (more)	1st: {{{1st ionization energy}}} kJ·mol−1
	2nd: {{{2nd ionization energy}}} kJ·mol−1
	3rd: {{{3rd ionization energy}}} kJ·mol−1
Atomic radius	128 pm
Covalent radius	139±5 pm
Miscellanea
Crystal structure	body-centered cubic
Magnetic ordering	antiferromagnetic
Electrical resistivity	(20 °C) 125Ω·m
Thermal conductivity	93.9 W·m−1·K−1
Thermal expansion	(25 °C) 4.9 µm·m−1·K−1
Speed of sound (thin rod)	(20 °C) 5940 m·s−1
Young's modulus	279 GPa
Shear modulus	115 GPa
Bulk modulus	160 GPa
Poisson ratio	0.21
Vickers hardness	1060 MPa
Brinell hardness	687-6500 MPa
CAS registry number	7440-47-3
Most stable isotopes
iso NA half-life DM DE (MeV) DP 50Cr 4.345% >1.3×1018 y (β+β+) 1.167 50Ti 52Cr 83.789% 52Cr is stable with 28 neutrons 53Cr 9.501% 53Cr is stable with 29 neutrons 54Cr 2.365% 54Cr is stable with 30 neutrons Decay modes in parentheses are predicted, but have not yet been observed

References

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