Krom — Cr
Grundämnet Krom är ett grundämne av typen Övergångsmetall med symbolen Cr. Det har en atommassa på 51.9961 u och elektronkonfigurationen [Ar] 3d5 4s1.
Synthétique
Radioactif
Liquide
Gaz
2482°
-1
1
2
3
4
5
6
8
13
1
- Atomnummer
- 24
- Atommassa
- 51.9961
- Symbol
- Cr
- Smältpunkt
- 1857
- Kokpunkt
- 2482
- Densitet
- 7.15
- Period
- 4
- Grupp
- 6
- Upptäckt
- 1797 Vauquelin
- Förekomst
- 102
- Radie
- 1.9
- Elektronegativitet
- 1.66
- Jonisering
- 6.7665
- Isotop
- 9
- Elektronkonfiguration
- [Ar] 3d5 4s1
- Oxidationstillstånd
- -2,-1,1,2,3,4,5,6
- Elektron
- 2,8,13,1
Mineraler som innehåller Krom
| förnamn | Hårdhet | Densitet | Kemisk formel |
|---|---|---|---|
| Andreyivanovite | — | 0.00 | FeCrP |
| Ankangite | — | 4.44 | Ba(Ti,V3+,Cr)8O16 |
| Ardennite-(V) | — | 3.55 | Mn2+4Al4(AlMg)(VO4)(SiO4)2(Si3O10)(OH)6 |
| Barbertonite | — | 2.10 | Mg6Cr2(CO3)(OH)16·4H2O |
| Batisivite | — | 4.62 | BaTi6(V,Cr)8Si2O29 |
| Bentorite | — | 2.03 | Ca6Cr2(SO4)3(OH)12·26H2O |
| Bouazzerite | — | 2.81 | Bi6(Mg,Co)11Fe14(AsO4)18O12(OH)4·86H2O |
| Bracewellite | — | 4.45 | CrO(OH) |
| Brezinaite | — | 4.12 | Cr3S4 |
| Bushmakinite | — | 6.22 | Pb2Al(PO4)(VO4)(OH) |
| Carlosruizite | — | 3.42 | K3Na2Na3Mg5(IO3)6(SeO4)6·6H2O |
| Carlsbergite | — | 5.90 | CrN |
| Carmichaelite | — | 4.13 | (Ti,Cr,Fe)(O,OH)2 |
| Cassedanneite | — | 6.00 | Pb5(VO4)2(CrO4)2·H2O |
| Caswellsilverite | — | 3.21 | NaCrS2 |
| Chromatite | — | 3.14 | CaCr6+O4 |
| Chrombismite | — | 9.80 | Bi16CrO27 |
| Chromceladonite | — | 2.90 | KMgCrSi4O10(OH)2 |
| Chromferide | — | 6.69 | Fe1.5Cr0.2 |
| Chromio-pargasite | — | 3.12 | NaCa2(Mg4Cr)(Si6Al2)O22(OH)2 |
| Chromite | — | 4.50 | Fe2+Cr2O4 |
| Chromium | — | 7.20 | Cr |
| Chromium-dravite | — | 0.00 | NaMg3Cr6(Si6O18)(BO3)3(OH)3OH |
| Chromo-alumino-povondraite | — | 3.23 | NaCr3(Al4Mg2)(Si6O18)(BO3)3(OH)3O |
| Chromomphacite | — | 0.00 | (Ca,Na)(Mg,Cr,Al)Si2O6 |
| Chromphyllite | — | 2.88 | KCr2(Si3Al)O10(OH)2 |
| Chromschieffelinite | — | 5.89 | Pb10Te6+6O20(OH)14(CrO4)·5H2O |
| Cochromite | — | 5.22 | CoCr2O4 |
| Crichtonite | — | 4.46 | Sr(Mn,Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH)38 |
| Crocoite | — | 5.90 | PbCrO4 |
| Cronusite | — | 2.51 | Ca0.2CrS2·2H2O |
| Cuprokalininite | — | 4.16 | CuCr2S4 |
| Daubréelite | — | 3.81 | FeCr2S4 |
| Davidite-(Ce) | — | 4.42 | Ce(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| Davidite-(La) | — | 4.42 | La(Y,U)Fe2(Ti,Fe,Cr,V)18(O,OH,F)38 |
| Deanesmithite | — | 8.00 | Hg1+2Hg2+3S2OCrO4 |
| Dessauite-(Y) | — | 4.68 | Sr(Y,U,Mn)Fe2(Ti,Fe,Cr,V)18(O,OH)38 |
| Dietzeite | — | 3.62 | Ca2(IO3)2CrO4·H2O |
| Dissakisite-(La) | — | 3.79 | CaLaMgAl2(Si2O7)(SiO4)O(OH) |
| Dukeite | — | 7.17 | Bi3+24Cr6+8O57(OH)6·3H2O |
| Edoylerite | — | 7.00 | Hg2+3(Cr6+O4)S2 |
| Embreyite | — | 6.45 | Pb5(CrO4)2(PO4)2·H2O |
| Eskolaite | — | 5.18 | Cr2O3 |
| Ferchromide | — | 6.00 | Cr1.5Fe0.2 |
| Ferrohögbomite-2N2S | — | 0.00 | (Fe,Mg,Zn,Al)3(Al,Ti,Fe)8O15(OH) |
| Florensovite | — | 4.00 | Cu1+(Cr3+1.5Sb5+0.5)S4 |
| Fornacite | — | 6.27 | CuPb2(CrO4)(AsO4)(OH) |
| George-ericksenite | — | 3.04 | Na6CaMg(IO3)6(CrO4)2·12H2O |
| Georgerobinsonite | — | 0.00 | Pb4(CrO4)2(OH)2FCl |
| Grimaldiite | — | 4.11 | CrO(OH) |
| Guyanaite | — | 4.53 | CrO(OH) |
| Hapkeite | — | 0.00 | Fe2Si |
| Hashemite | — | 4.59 | BaCr6+O4 |
| Hawthorneite | — | 5.00 | BaMgTi3Cr4Fe2+2Fe3+2O19 |
| Heideite | — | 4.10 | (Fe,Cr)1.15(Ti,Fe)2S4 |
| Hemihedrite | — | 6.42 | Pb10Zn(CrO4)6(SiO4)2F2 |
| Iquiqueite | — | 2.05 | K3Na4Mg(CrO4)B24O39(OH)·12H2O |
| Iranite | — | 5.80 | Pb10Cu(CrO4)6(SiO4)2(OH)2 |
| Isovite | — | 7.40 | (Cr,Fe)23C6 |
| Jade | — | 3.00 | Ca2(Mg,Fe)5Si8O22(OH)2 |
| Joegoldsteinite | — | 3.71 | MnCr2S4 |
| Kalininite | — | 0.00 | ZnCr2S4 |
| Kassite | — | 3.42 | CaTi2O4(OH)2 |
| Keilite | — | 0.00 | FeS |
| Khristovite-(Ce) | — | 4.05 | CaCeMgMn2+Al(Si2O7)(SiO4)(OH)F |
| Knorringite | — | 3.76 | Mg3Cr2(SiO4)3 |
| Kosmochlor | — | 3.60 | NaCrSi2O6 |
| Krinovite | — | 3.38 | Na4(Mg8Cr3+4)O4[Si12O36] |
| Kromdiopsid | — | 3.30 | (Ca,Cr)MgSi2O6 |
| Lakargiite | — | 4.59 | CaZrO3 |
| Lindsleyite | — | 4.63 | (Ba,Sr)(Zr,Ca)(Fe,Mg)2(Ti,Cr,Fe)18O38 |
| Lópezite | — | 2.69 | K2Cr2O7 |
| Loveringite | — | 4.41 | (Ca,Ce,La)(Zr,Fe)(Mg,Fe)2(Ti,Fe,Cr,Al)18O38 |
| Macquartite | — | 5.49 | Cu2Pb7(CrO4)4(SiO4)2(OH)2 |
| Magnesiochromite | — | 4.20 | MgCr3+2O4 |
| Magnesiosadanagaite | — | 3.00 | NaCa2[Mg3(Fe3+,Al)2](Si5Al3)O22(OH)2 |
| Manganochromite | — | 4.86 | Mn2+Cr2O4 |
| Mapiquiroite | — | 0.00 | (Sr,Pb)(U,Y)Fe2(Ti,Fe3+,Cr3+)18O38 |
| Mariinskite | — | 4.25 | BeCr2O4 |
| Mathiasite | — | 4.60 | (K,Ba,Sr)(Zr,Fe)(Mg,Fe)2(Ti,Cr,Fe)18O38 |
| Mcconnellite | — | 5.49 | Cu1+CrO2 |
| Molybdofornacite | — | 6.60 | CuPb2MoO4AsO4(OH) |
| Mongshanite | — | 0.00 | (Mg,Cr,Fe,Ca,K)2(Ti,Zr,Cr,Fe)5O12 |
| Mountkeithite | — | 2.12 | Mg11Fe3+3(SO4)3.5(OH)24·11H2O |
| Murchisite | — | 4.22 | Cr5S6 |
| Natalyite | — | 3.55 | NaV3+Si2O6 |
| Nichromite | — | 5.24 | NiCr2O4 |
| Olkhonskite | — | 4.48 | Cr2Ti3O9 |
| Oxy-chromium-dravite | — | 3.30 | NaCr3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| Painite | — | 4.00 | CaZrAl9O15(BO3) |
| Petterdite | — | 3.97 | PbCr2(CO3)2(OH)4·H2O |
| Phoenicochroite | — | 7.01 | Pb2O(CrO4) |
| Polyakovite-(Ce) | — | 4.75 | (Ce,Ca)4MgCr2(Ti,Nb)2Si4O22 |
| Putnisite | — | 2.23 | SrCa4Cr3+8(CO3)8SO4(OH)16·25H2O |
| Qusongite | — | 15.84 | WC |
| Redingtonite | — | 1.76 | Fe2+Cr2(SO4)4·22H2O |
| Redledgeite | — | 3.72 | Ba(Ti4+6Cr3+2)O16 |
| Reynoldsite | — | 6.57 | Pb2Mn4+2O5(CrO4) |
| Rilandite | — | 0.00 | Cr3+6SiO11·5H2O(?) |
| Santanaite | — | 9.16 | Pb11CrO16 |
| Schöllhornite | — | 2.70 | Na0.3CrS2·H2O |
| Schreibersite | — | 7.00 | (Fe,Ni,Cr)3P |
| Schreyerite | — | 4.00 | V3+2Ti4+3O9 |
| Senaite | — | 5.30 | Pb(Mn,Y,U)(Fe,Zn)2(Ti,Fe,Cr,V)18(O,OH)38 |
| Shuiskite | — | 3.24 | Ca2MgCr2(SiO4)(Si2O7)(OH)2·H2O |
| Stichtite | — | 2.20 | Mg6Cr2CO3(OH)16·4H2O |
| Tarapacáite | — | 2.74 | K2CrO4 |
| Tongbaite | — | 6.00 | Cr3C2 |
| Uvarovite | — | 3.40 | Ca3Cr2(SiO4)3 |
| Vanadio-oxy-chromium-dravite | — | 3.30 | NaV3(Cr4Mg2)(Si6O18)(BO3)3(OH)3O |
| Vauquelinite | — | 6.00 | CuPb2(CrO4)(PO4)(OH) |
| Verbierite | — | 0.00 | BeCr3+2TiO6 |
| Volkonskoite | — | 2.00 | Ca0.3(Cr,Mg)2(Si,Al)4O10(OH)2·4H2O |
| Vuorelainenite | — | 4.64 | Mn2+V3+2O4 |
| Warwickite | — | 3.36 | (Mg,Ti,Fe,Cr,Al)2O(BO3) |
| Wattersite | — | 8.91 | Hg1+4Hg2+O2(CrO4) |
| Woodallite | — | 2.06 | Mg6Cr2(OH)16Cl2·4H2O |
| Xieite | — | 5.34 | FeCr2O4 |
| Yarlongite | — | 7.19 | Cr4Fe4NiC4 |
| Yedlinite | — | 5.85 | Pb6CrCl6(O,OH,H2O)8 |
| Yimengite | — | 4.34 | K(Cr,Ti,Fe,Mg)12O19 |
| Zhanghengite | — | 8.00 | CuZn |
| Zincochromite | — | 5.00 | ZnCr2O4 |
| Zoltaiite | — | 4.83 | BaV4+2V3+12Si2O27 |