Cobalt

Cobalt, ₂₇Co
Cobalt
Pípè	/ˈkoʊbɒlt/
Ìhànsójú	hard lustrous gray metal
Ìwúwo átọ̀mù Ar, std(Co)	58.933194(3)
Cobalt ní orí tábìlì àyè
	iron ← cobalt → nickel
Nọ́mbà átọ̀mù (Z)	27
Ẹgbẹ́	group 9
Àyè	àyè 4
Àdìpọ̀	Àdìpọ̀-d
Ẹ̀ka ẹ́límẹ́ntì	Transition metal
Ìtò ẹ̀lẹ́ktrọ́nù	[Ar] 3d7 4s2
Iye ẹ̀lẹ́ktrọ́nù lórí ìpele kọ̀ọ̀kan	2, 8, 15, 2
Àwọn ohun ìní ara
	metallic gray
Ìfarahàn at STP	Àdàkọ:Infobox element/symbol-to-phase
Ìgbà ìyọ́	1768 K (1495 °C, 2723 °F)
Ígbà ìhó	3200 K (2927 °C, 5301 °F)
Kíki (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)
Atomic properties
Oxidation states	−3, −1, 0, +1, +2, +3, +4, +5 Àdàkọ:Infobox element/symbol-to-oxidation-state/comment
Electronegativity	Pauling scale: 1.88
energies	(more);
Atomic radius	empirical: 125 pm
Covalent radius	126±3 (low spin), 150±7 (high spin) pm
	Color lines in a spectral rangeSpectral lines of cobalt
Other properties
Natural occurrence	primordial
Crystal structure	hexagonal
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
Main isotopes of cobalt
	Àdàkọ:Category-inline; wo; ọ̀rọ̀; àtúnṣe; \| references

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