Cobalt

Cobalt, ₂₇Co

Cobalt
Pípè	/ˈkoʊbɒlt/[1]
Ìhànsójú	hard lustrous gray metal
Ìwúwo átọ̀mù Ar, std(Co)	58.933194(3)[2]
Cobalt ní orí tábìlì àyè
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson - ↑ Co ↓ Rh 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)
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	−3, −1, 0, +1, +2, +3, +4, +5[3] 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 range Spectral 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
Iso­tope Abun­dance Half-life (t1/2) Decay mode Pro­duct 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
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