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Co - Cobalt - TRANSITION METAL
Synthetic
Radioactive
Liquid
Gaseous

Electronic configuration diagram
Name | Cobalt |
Number | 27 |
Atomic | 58.933194 |
Symbol | Co |
Fusion | 1495 |
Boiling | 2870 |
Density | 8.86 |
Period | 4 |
Group | 9 |
Discovery | 1735 Brandt |
Abundance | 25 |
Radius | 1.7 |
Electronegativity | 1.88 |
Ionization | 7.881 |
Number of isotopes | 14 |
Electronic configuration | [Ar] 3d7 4s2 |
Oxidation states | -1,1,2,3,4,5 |
Electron by energy level | 2,8,15,2 |
Mineral | Hardness | Density | Formula |
Ahlfeldite | 2.00 / 2.50 | 3.37 | NiSeO3·2H2O |
Allabogdanite | 5.00 / 6.00 | 7.11 | (Fe,Ni)2P |
Alloclasite | 5.00 / 5.00 | 6.17 | CoAsS |
Andreyivanovite | FeCrP | ||
Aplowite | 3.00 / 3.00 | 2.33 | CoSO4·4H2O |
Arhbarite | Cu2MgAsO4(OH)3 | ||
Asbolane | 6.00 / 6.00 | Mn4+(O,OH)2·(Co,Ni,Mg,Ca)x(OH)2x·nH2O | |
Bieberite | 2.00 / 2.00 | 1.90 | CoSO4·7H2O |
Boothite | 2.00 / 2.50 | 2.10 | CuSO4·7H2O |
Bornhardtite | 4.00 / 4.00 | Co2+Co3+2Se4 | |
Bouazzerite | 2.81 | Bi6(Mg,Co)11Fe14(AsO4)18O12(OH)4·86H2O | |
Burgessite | 3.00 / 3.00 | 2.93 | Co2(H2O)4(AsO3OH)2·H2O |
Carminite | 3.50 / 3.50 | 5.03 | PbFe3+2(AsO4)2(OH)2 |
Carrollite | 4.50 / 5.50 | 4.50 | CuCo2S4 |
Cattierite | 4.50 / 4.50 | 4.80 | CoS2 |
Clinosafflorite | 4.50 / 5.00 | 7.46 | CoAs2 |
Cobaltarthurite | 3.50 / 4.00 | 3.22 | CoFe3+2(AsO4)2(OH)2·4H2O |
Cobaltaustinite | 4.50 / 4.50 | 4.00 | CaCoAsO4(OH) |
Cobaltite | 5.50 / 5.50 | 6.33 | CoAsS |
Cobaltkieserite | 2.00 / 3.00 | 3.28 | CoSO4·H2O |
Cobaltkoritnigite | 2.00 / 3.00 | 3.44 | Co(AsO3OH)·H2O |
Cobaltlotharmeyerite | 4.50 / 4.50 | CaCo2(AsO4)2·2H2O | |
Cobaltneustädtelite | 4.50 / 4.50 | 5.81 | Bi2Fe3+(Co,Fe3+)(AsO4)2(O,OH)4 |
Cobaltoblödite | 2.50 / 2.50 | 2.35 | Na2Co(SO4)2·4H2O |
Cobaltogordaite | NaCo4(SO4)(OH)6Cl·6H2O | ||
Cobaltomenite | 2.00 / 2.50 | 3.39 | CoSe4+O3·2H2O |
Cobaltpentlandite | 4.00 / 5.00 | 5.22 | Co9S8 |
Cobalttsumcorite | 4.50 / 4.50 | 5.31 | PbCo2(AsO4)2·2H2O |
Cobaltzippeite | 5.00 / 5.50 | 4.30 | Co(UO2)2(SO4)O2·3.5H2O |
Cochromite | 7.00 / 7.00 | 5.22 | CoCr2O4 |
Cohenite | 5.50 / 6.00 | 7.20 | Fe3C |
Comblainite | 2.00 / 2.00 | 3.05 | Ni4Co3+2CO3(OH)12·3H2O |
Costibite | 6.00 / 6.00 | 6.89 | CoSbS |
Erythrite | 1.50 / 2.00 | 3.06 | Co3(AsO4)2·8H2O |
Ferroskutterudite | 6.00 / 6.50 | FeAs3 | |
Fletcherite | 5.00 / 5.00 | 4.00 | CuNi2S4 |
Freboldite | 2.50 / 3.00 | 7.00 | CoSe |
Gillardite | 3.00 / 3.00 | Cu3NiCl2(OH)6 | |
Glaucodot | 5.00 / 5.00 | 5.90 | Co0.5Fe0.5AsS |
Guarinoite | 1.50 / 2.00 | 2.80 | Zn6SO4(OH)10·5H2O |
Hastite | 6.00 / 6.00 | 7.22 | CoSe2 |
Heterogenite | 3.00 / 5.00 | 4.13 | Co3+O(OH) |
Hloušekite | 2.00 / 3.00 | 3.30 | (Ni,Co)Cu4(AsO4)2(AsO3OH)2·9H2O |
Jaipurite | 5.45 | CoS | |
Jamborite | 2.67 | Ni2+1-xCo3+x(OH)2-x(SO4)x·nH2O where [x=1/3; n=(1-x)] | |
Jolliffeite | 6.00 / 6.50 | 7.10 | NiAsSe |
Julienite | 1.65 | Na2Co(SCN)4·8H2O | |
Karpenkoite | Co3(V2O7)(OH)2·2H2O | ||
Kieftite | 5.00 / 5.50 | 7.20 | CoSb3 |
Kolwezite | 4.00 / 4.00 | 3.97 | CuCoCO3(OH)2 |
Krettnichite | 4.50 / 4.50 | 4.50 | PbMn3+2(VO4)2(OH)2 |
Langisite | 6.00 / 6.50 | 8.17 | CoAs |
Leverettite | 3.00 / 3.00 | 3.71 | Cu3CoCl2(OH)6 |
Linnaeite | 4.50 / 5.50 | 4.80 | Co3S4 |
Magnesiopascoite | 2.50 / 2.50 | 2.43 | Ca2MgV5+10O28·16H2O |
Martyite | 3.00 / 3.00 | 3.37 | Zn3V2O7(OH)2·2H2O |
Mattagamite | 5.50 / 5.50 | 8.00 | CoTe2 |
Melliniite | 8.00 / 8.50 | 7.88 | (Ni,Fe)4P |
Metakirchheimerite | 2.00 / 2.50 | 3.20 | Co(UO2)2(AsO4)2·8H2O |
Modderite | 4.00 / 4.00 | 8.00 | CoAs |
Moorhouseite | 2.50 / 2.50 | 1.97 | CoSO4·6H2O |
Neustädtelite | 4.50 / 4.50 | 5.81 | Bi2Fe3+(Fe3+,Co)2(AsO4)2(O,OH)4 |
Nichromite | 6.00 / 6.50 | 5.24 | NiCr2O4 |
Nickellotharmeyerite | 4.50 / 4.50 | 4.45 | CaNi2(AsO4)2·2H2O |
Nickelschneebergite | 4.00 / 4.50 | 5.23 | BiNi2(AsO4)2(OH)·H2O |
Nickelskutterudite | 5.50 / 6.00 | 6.50 | NiAs3-x |
Oenite | 5.00 / 5.50 | 7.92 | CoSbAs |
Oursinite | 3.00 / 3.50 | 3.67 | Co(UO2)2(SiO3OH)2·6H2O |
Paganoite | 1.00 / 2.00 | NiBi3+OAsO4 | |
Pakhomovskyite | 2.00 / 2.00 | 2.71 | Co3(PO4)2·8H2O |
Paracostibite | 7.00 / 7.00 | 6.90 | CoSbS |
Penroseite | 2.50 / 3.00 | 6.58 | NiSe2 |
Petewilliamsite | 1.50 / 2.50 | 4.90 | (Ni,Co)30(As2O7)15 |
Pradetite | 3.31 | CoCu4(AsO4)2(AsO3OH)2·9H2O | |
Rappoldite | 4.50 / 4.50 | PbCo2(AsO4)2·2H2O | |
Roselite | 3.50 / 3.50 | 3.69 | Ca2Co(AsO4)2·2H2O |
Roselite- | 3.50 / 4.00 | 3.71 | Ca2Co(AsO4)2·2H2O |
Safflorite | 4.00 / 5.00 | 6.90 | CoAs2 |
Schneebergite | 4.00 / 4.50 | 5.28 | BiCo2(AsO4)2(OH)·H2O |
Siegenite | 5.00 / 5.50 | 4.50 | CoNi2S4 |
Skutterudite | 5.50 / 6.00 | 6.10 | CoAs3-x |
Smolyaninovite | 2.00 / 2.00 | Co3Fe3+2(AsO4)4·11H2O | |
Spherocobaltite | 3.00 / 4.00 | 4.21 | CoCO3 |
Stavelotite-(La) | 4.49 | La3Mn2+3Cu2+(Mn3+,Fe3+,Mn4+)26(Si2O7)6O30 | |
Sugakiite | 2.00 / 3.00 | Cu(Fe,Ni)8S8 | |
Thérèsemagnanite | 1.50 / 2.00 | 2.52 | NaCo4(SO4)(OH)6Cl·6H2O |
Trogtalite | 7.00 / 7.00 | 7.00 | CoSe2 |
Tyrrellite | 3.50 / 3.50 | 6.00 | (Co,Cu,Ni)3Se4 |
Villamanínite | 4.50 / 4.50 | 4.52 | CuS2 |
Vozhminite | 4.50 / 5.00 | 6.20 | Ni4AsS2 |
Wairauite | 5.00 / 5.00 | 8.00 | CoFe |
Wendwilsonite | 3.00 / 4.00 | 3.52 | Ca2Mg(AsO4)2·2H2O |
Westerveldite | 5.50 / 6.00 | 8.00 | FeAs |
Willyamite | 5.50 / 5.50 | 6.76 | CoSbS |
Wupatkiite | 1.50 / 2.00 | 1.87 | CoAl2(SO4)4·22H2O |