Cobalt

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Cobalt
27Co
-

Co

Rh
ironcobaltnickel
Ìhànsójú
hard lustrous gray metal
Àwọn ìdámọ́ wíwọ́pọ̀
Orúkọ, àmì-ìdámọ́, nọ́mbà cobalt, Co, 27
Ẹ̀ka ẹ́límẹ̀nti transition metal
Ẹgbẹ́, àsìkò, àdìpò 94, d
Ìwúwo átọ́mù 58.933195(5)
Ìtòléra ẹ̀lẹ́ktrónì [Ar] 4s2 3d7
2, 8, 15, 2
Physical properties
Color metallic gray
Density (near r.t.) 8.90 g·cm−3
Liquid density at m.p. 7.75 g·cm−3
Melting point 1768 K, 1495 °C, 2723 °F
Boiling point 3200 K, 2927 °C, 5301 °F
Heat of fusion 16.06 kJ·mol−1
Heat of vaporization 377 kJ·mol−1
Molar heat capacity 24.81 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1790 1960 2165 2423 2755 3198
Atomic properties
Oxidation states 5, 4 , 3, 2, 1 [1], -1
(amphoteric oxide)
Electronegativity 1.88 (Pauling scale)
Ionization energies
(more)
1st: 760.4 kJ·mol−1
2nd: 1648 kJ·mol−1
3rd: 3232 kJ·mol−1
Atomic radius 125 pm
Covalent radius 126±3 (low spin), 150±7 (high spin) pm
Miscellanea
Crystal structure hexagonal
Cobalt has a hexagonal crystal structure
Magnetic ordering ferromagnetic
Electrical resistivity (20 °C) 62.4 nΩ·m
Thermal conductivity 100 W·m−1·K−1
Thermal expansion (25 °C) 13.0 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 4720 m·s−1
Young's modulus 209 GPa
Shear modulus 75 GPa
Bulk modulus 180 GPa
Poisson ratio 0.31
Mohs hardness 5.0
Vickers hardness 1043 MPa
Brinell hardness 700 MPa
CAS registry number 7440-48-4
Àwọn ísótòpù dídúró jùlọ
Main article: Àwọn ísótòpù cobalt
iso NA half-life DM DE (MeV) DP
56Co syn 77.27 d ε 4.566 56Fe
57Co syn 271.79 d ε 0.836 57Fe
58Co syn 70.86 d ε 2.307 58Fe
59Co 100% 59Co is stable with 32 neutrons
60Co syn 5.2714 years β,γ,γ 2.824 60Ni
· r



Itokasi[àtúnṣe | àtúnṣe àmìọ̀rọ̀]

  1. Choi, Hyungsoo (2003). "Liquid Cobalt (I) Hydride Complexes as Precursors for Chemical Vapor Deposition". Chemistry of Materials 15: 3121. doi:10.1021/cm030100e.