Krómíọ̀mù

Chromium, ₂₄Cr

Chromium
Ìhànsójú	silvery metallic
Ìwúwo átọ̀mù Ar, std(Cr)	51.9961(6)[1]
Chromium ní orí tábìlì àyè
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Nọ́mbà átọ̀mù (Z)	24
Ẹgbẹ́	group 6
Àyè	àyè 4
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Ar] 3d5 4s1
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 13, 1
Àwọn ohun ìní ara
Ìfarahàn at STP	solid
Ìgbà ìyọ́	2180 K ​(1907 °C, ​3465 °F)
Ígbà ìhó	2944 K ​(2671 °C, ​4840 °F)
Kíki (near r.t.)	7.19 g/cm3
when liquid (at m.p.)	6.3 g/cm3
Heat of fusion	21.0 kJ/mol
Heat of	339.5 kJ/mol
Molar heat capacity	23.35 J/(mol·K)
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	−4, −2, −1, 0, +1, +2, +3, +4, +5, +6 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.66
energies	(more)
Atomic radius	empirical: 128 pm
Covalent radius	139±5 pm
Color lines in a spectral range Spectral lines of chromium
Other properties
Natural occurrence	primordial
Crystal structure	​(bcc)
Speed of sound thin rod	5940 m/s (at 20 °C)
Thermal expansion	4.9 µm/(m·K) (at 25 °C)
Thermal conductivity	93.9 W/(m·K)
Electrical resistivity	125 n Ω·m (at 20 °C)
Magnetic ordering	AFM (rather: SDW[2])
Young's modulus	279 GPa
Shear modulus	115 GPa
Bulk modulus	160 GPa
Poisson ratio	0.21
Mohs hardness	8.5
Vickers hardness	1060 MPa
Brinell hardness	1120 MPa
CAS Number	7440-47-3
Main isotopes of chromium
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 50Cr 4.345% > 1.8×1017y εε - 50Ti 51Cr syn 27.7025 d ε - 51V γ 0.320 - 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
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