ଛାଞ୍ଚ:Infobox Cobalt

Cobalt,  ₂₇Co

ସାଧାରଣ ଗୁଣ
ନାମ, ପ୍ରତୀକ	cobalt, Co
Appearance	hard lustrous gray metal
ଉଚ୍ଚାରଣ	/ˈkoʊbɒlt/ KOH-bolt
Cobalt in the periodic table
- ↑ Co ↓ Rh iron ← cobalt → nickel
ପରମାଣୁ କ୍ରମାଙ୍କ (Z)	27
ଶ୍ରେଣୀ, ବ୍ଳକ	group 9, d-block
ପର୍ଯ୍ୟାୟ	period 4
ମୌଳିକ ପ୍ରକାର	transition metal
ମାନକ ପରମାଣବିକ ଓଜନ (±) (Ar)	58.933195(5)
ଇଲେକ୍‌ଟ୍ରୋନ୍ ବିନ୍ୟାସ	[Ar] 4s2 3d7
per shell	2, 8, 15, 2
ଭୌତିକ ଗୁଣ
metallic gray
ଅବସ୍ଥା	solid
ଗଳନାଙ୍କ	1768 K ​(1495 °C, ​2723 °F)
ସ୍ଫୁଟନାଙ୍କ	3200 K ​(2927 °C, ​5301 °F)
Density near r.t.	8.90 g/cm3
when liquid, at m.p.	7.75 g/cm3
Heat of fusion	16.06 kJ/mol
Heat of	377 kJ/mol
Molar heat capacity	24.81 J/(mol·K)
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 ​amphoteric oxide
Electronegativity	Pauling scale: 1.88
energies	(more)
Atomic radius	empirical: 125 pm
Covalent radius	126±3 (low spin), 150±7 (high spin) pm
Miscellanea
Crystal structure	​hexagonal close-packed (hcp)
Speed of sound thin rod	4720 m/s (at 20 °C)
Thermal expansion	13.0 µm/(m·K) (at 25 °C)
Thermal conductivity	100 W/(m·K)
Electrical resistivity	62.4 n Ω·m (at 20 °C)
Magnetic ordering	ferromagnetic
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 Number	7440-48-4
ଇତିହାସ
ଆବିଷ୍କାର	Georg Brandt (1732)
Most stable isotopes of 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 2.824 60Ni

References

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