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Template:List of oxidation states of the elements

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This table lists only the occurrences in compounds and complexes, not pure elements in their standard state or allotropes.

  Noble gas
+1 Bold values are main oxidation states
Element Negative states Positive states Group Notes
−5 −4 −3 −2 −1 0 +1 +2 +3 +4 +5 +6 +7 +8 +9
Z
1 hydrogen H −1 +1 1
2 helium He 18
3 lithium Li +1 1
4 beryllium Be 0 +1 +2 2 [1] [2]
5 boron B −5 −1 0 +1 +2 +3 13 [3] [4][5] [6] [6][7][8]
6 carbon C −4 −3 −2 −1 0 +1 +2 +3 +4 14 [6] [6] [6] [6] [6] [6]
7 nitrogen N −3 −2 −1 0 +1 +2 +3 +4 +5 15 [6] [6][9] [6] [6] [6]
8 oxygen O −2 −1 0 +1 +2 16 [6] [6] [6]
9 fluorine F −1 17
10 neon Ne 18
11 sodium Na −1 0 +1 1 [6][10]
12 magnesium Mg 0 +1 +2 2 [11] [12]
13 aluminium Al −2 −1 0 +1 +2 +3 13 [13] [6][14] [15] ?
14 silicon Si −4 −3 −2 −1 0 +1 +2 +3 +4 14 [6] [6] [6][16] [6][17] [6] [6]
15 phosphorus P −3 −2 −1 0 +1 +2 +3 +4 +5 15 [6] [6][18] [6][19] [6] [6]
16 sulfur S −2 −1 0 +1 +2 +3 +4 +5 +6 16 [6] [6] [6] [6]
17 chlorine Cl −1 +1 +2 +3 +4 +5 +6 +7 17 [6] [6] [6]
18 argon Ar 18
19 potassium K −1 +1 1 ?
20 calcium Ca +1 +2 2 [20]
21 scandium Sc 0 +1 +2 +3 3 [21] [22] [23]
22 titanium Ti −2 −1 0 +1 +2 +3 +4 4 [6][24] [25] [6] [6] ?
23 vanadium V −3 −1 0 +1 +2 +3 +4 +5 5 [6] [6] [6] [6] [6] ?
24 chromium Cr −4 −2 −1 0 +1 +2 +3 +4 +5 +6 6 [6] [6] [6] [6] [6] [6] ?
25 manganese Mn −3 −1 0 +1 +2 +3 +4 +5 +6 +7 7 [6] [6] [6], [6] [6], [6] ?
26 iron Fe −4 −2 −1 0 +1 +2 +3 +4 +5 +6 +7 8 [6] [6] [26] [6] [27] [6] [28] ?
27 cobalt Co −3 −1 0 +1 +2 +3 +4 +5 9 [6] [6] [6] [29] ?
28 nickel Ni −2 −1 0 +1 +2 +3 +4 10 [6] [30] [6] [31] ?
29 copper Cu −2 0 +1 +2 +3 +4 11 [32] [6] [6] [6] ?
30 zinc Zn −2 0 +1 +2 12 ?
31 gallium Ga −5 −4 −3 −2 −1 0 +1 +2 +3 13 [33] [6] [6][34] ?
32 germanium Ge −4 −3 −2 −1 0 +1 +2 +3 +4 14 [35] [6] [6] ?
33 arsenic As −3 −2 −1 0 +1 +2 +3 +4 +5 15 [36] [37] [6] ?
34 selenium Se −2 −1 0 +1 +2 +3 +4 +5 +6 16 [38] [39] ?
35 bromine Br −1 +1 +2 +3 +4 +5 +7 17 [40] [6] [6]
36 krypton Kr +1 +2 18 ?
37 rubidium Rb −1 +1 1 ?
38 strontium Sr +1 +2 2 [41]
39 yttrium Y 0 +1 +2 +3 3 [42] [6] ?
40 zirconium Zr +1 +2 +3 +4 4 [6] [43][44] [6]
41 niobium Nb −3 −1 0 +1 +2 +3 +4 +5 5 [6] [6] [6] [6] ?
42 molybdenum Mo −4 −2 −1 0 +1 +2 +3 +4 +5 +6 6 [6] [6] [6] [6] [6] [6] ?
43 technetium Tc −3 −1 +1 +2 +3 +4 +5 +6 +7 7 [6] [6] [6] [6] [6] [6] [6]
44 ruthenium Ru −4 −2 +1 +2 +3 +4 +5 +6 +7 +8 8 [6] [6] [6] [6] [6] [6] [6] ?
45 rhodium Rh −3 −1 +1 +2 +3 +4 +5 +6 +7 9 [45] [6] [6] [6] [6] [6] [6] [46]
46 palladium Pd +1 +2 +3 +4 +5 10 [47] ?
47 silver Ag −2 −1 0 +1 +2 +3 11 [48] [6] [6] ?
48 cadmium Cd −2 +1 +2 12 ?
49 indium In −5 −2 −1 0 +1 +2 +3 13 [49] [6] [6] [50] ?
50 tin Sn −4 −3 −2 −1 0 +1 +2 +3 +4 14 [51] [52] [53] ?
51 antimony Sb −3 −2 −1 0 +1 +2 +3 +4 +5 15 [54] ?
52 tellurium Te −2 −1 0 +1 +2 +3 +4 +5 +6 16 [6] ?
53 iodine I −1 +1 +2 +3 +4 +5 +6 +7 17 [55] ?
54 xenon Xe +2 +4 +6 +8 18 [56]
55 caesium Cs −1 +1 1 [57]
56 barium Ba +1 +2 2 ?
57 lanthanum La 0 +1 +2 +3 f-block groups [42] [58] [6]
58 cerium Ce +1 +2 +3 +4 f-block groups [6] ?
59 praseodymium Pr 0 +1 +2 +3 +4 +5 f-block groups [42] [59] ?
60 neodymium Nd 0 +2 +3 +4 f-block groups [42] [6]
61 promethium Pm +2 +3 f-block groups ?
62 samarium Sm 0 +1 +2 +3 f-block groups [42] [60] [6]
63 europium Eu 0 +2 +3 f-block groups 0[42]
64 gadolinium Gd 0 +1 +2 +3 f-block groups [42] [6] [6]
65 terbium Tb 0 +1 +2 +3 +4 f-block groups [42] [58] [6] ?
66 dysprosium Dy 0 +1 +2 +3 +4 f-block groups [42] [6] ?
67 holmium Ho 0 +1 +2 +3 f-block groups [42] ?
68 erbium Er 0 +1 +2 +3 f-block groups [42] ?
69 thulium Tm 0 +1 +2 +3 f-block groups [42] [58] [6]
70 ytterbium Yb 0 +1 +2 +3 f-block groups [42] [58] [6]
71 lutetium Lu 0 +1 +2 +3 3 [42] ?
72 hafnium Hf −2 0 +1 +2 +3 +4 4 [6], [6] ?
73 tantalum Ta −3 −1 0 +1 +2 +3 +4 +5 5 [6] [6] [6] [6] ?
74 tungsten W −4 −2 −1 0 +1 +2 +3 +4 +5 +6 6 [6] [6] [6] [6] [6] [6] ?
75 rhenium Re −3 −1 0 +1 +2 +3 +4 +5 +6 +7 7 [6] [6] [6], [6] [6] [6] [6] [6] ?
76 osmium Os −4 −2 −1 0 +1 +2 +3 +4 +5 +6 +7 +8 8 [6] [6] [6] [6] [6] [6] [6] [6] ?
77 iridium Ir −3 −2 −1 +1 +2 +3 +4 +5 +6 +7 +8 +9 9 [6] [6] [6] [6] [6] [61] ?
78 platinum Pt −3 −2 −1 0 +1 +2 +3 +4 +5 +6 10 [6] [6] ?
79 gold Au −3 −2 −1 0 +1 +2 +3 +5 11 [6] [62] [6] [6] ?
80 mercury Hg −2 +1 +2 12 [63]
81 thallium Tl −5 −2 −1 +1 +2 +3 13 [64] ?
82 lead Pb −4 −2 −1 0 +1 +2 +3 +4 14 [6] [65] ?
83 bismuth Bi −3 −2 −1 0 +1 +2 +3 +4 +5 15 [6] [66] [6] ?
84 polonium Po −2 +2 +4 +5 +6 16 [67] [6]
85 astatine At −1 +1 +3 +5 +7 17 [6] [6] [6]
86 radon Rn +2 +6 18 ?
87 francium Fr +1 1
88 radium Ra +2 2
89 actinium Ac +3 f-block groups
90 thorium Th −1 +1 +2 +3 +4 f-block groups [68] [6] [6] ?
91 protactinium Pa +2 +3 +4 +5 f-block groups [6] [6] ?
92 uranium U −1 +1 +2 +3 +4 +5 +6 f-block groups [68] [69] [6] [6] ?
93 neptunium Np +2 +3 +4 +5 +6 +7 f-block groups [6] [70] [6] [6] ?
94 plutonium Pu +2 +3 +4 +5 +6 +7 +8 f-block groups [6], [6] [6] [6] ?
95 americium Am +2 +3 +4 +5 +6 +7 f-block groups [6] [6] [6] [6]
96 curium Cm +3 +4 +5 +6 f-block groups [6] [71] [72]
97 berkelium Bk +2 +3 +4 +5 f-block groups [6] [71] ?
98 californium Cf +2 +3 +4 +5 f-block groups [6] [6] [73][71]
99 einsteinium Es +2 +3 +4 f-block groups [6]
100 fermium Fm +2 +3 f-block groups [6]
101 mendelevium Md +2 +3 f-block groups [6]
102 nobelium No +2 +3 f-block groups [6]
103 lawrencium Lr +3 3
104 rutherfordium Rf +3 +4 4 [74]
105 dubnium Db +3 +4 +5 5 [74]
106 seaborgium Sg +3 +4 +5 +6 6 [74]
107 bohrium Bh +3 +4 +5 +7 7 [74]
108 hassium Hs +3 +4 +6 +8 8 [74]
109 meitnerium Mt +1 +3 +6 9 [74]
110 darmstadtium Ds +2 +4 +6 10 [74]
111 roentgenium Rg −1 +3 +5 11 [74]
112 copernicium Cn +2 +4 12 [74]
113 nihonium Nh 13
114 flerovium Fl 14
115 moscovium Mc 15
116 livermorium Lv −2 +4 16 [75]
117 tennessine Ts −1 +5 17
118 oganesson Og −1 +1 +2 +4 +6 18 [74] [76] [77] [77] [74]
  1. ^ Be(0) has been observed; see "Beryllium(0) Complex Found". Chemistry Europe. 13 June 2016.
  2. ^ "Beryllium: Beryllium(I) Hydride compound data" (PDF). bernath.uwaterloo.ca. Retrieved 2007-12-10.
  3. ^ B(−5) has been observed in Al3BC, see Schroeder, Melanie. "Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden" (in German). p. 139.
  4. ^ B(−1) has been observed in magnesium diboride (MgB2), see Keeler, James; Wothers, Peter (2014). Chemical Structure and Reactivity: An Integrated Approach. Oxford University Press. ISBN 9780199604135.
  5. ^ Braunschweig, H.; Dewhurst, R. D.; Hammond, K.; Mies, J.; Radacki, K.; Vargas, A. (2012). "Ambient-Temperature Isolation of a Compound with a Boron-Boron Triple Bond". Science. 336 (6087): 1420–2. Bibcode:2012Sci...336.1420B. doi:10.1126/science.1221138. PMID 22700924. S2CID 206540959.
  6. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak al am an ao ap aq ar as at au av aw ax ay az ba bb bc bd be bf bg bh bi bj bk bl bm bn bo bp bq br bs bt bu bv bw bx by bz ca cb cc cd ce cf cg ch ci cj ck cl cm cn co cp cq cr cs ct cu cv cw cx cy cz da db dc dd de df dg dh di dj dk dl dm dn do dp dq dr ds dt du dv dw dx dy dz ea eb ec ed ee ef eg eh ei ej ek el em en eo ep eq er es et eu ev ew ex ey ez fa fb fc fd fe ff fg fh fi fj fk fl fm fn fo fp fq fr fs ft fu fv fw fx fy fz ga gb gc gd ge gf gg gh gi gj gk Greenwood, Norman N.; Earnshaw, Alan (1997). Chemistry of the Elements (2nd ed.). Butterworth-Heinemann. p. 28. ISBN 978-0-08-037941-8.
  7. ^ Zhang, K.Q.; Guo, B.; Braun, V.; Dulick, M.; Bernath, P.F. (1995). "Infrared Emission Spectroscopy of BF and AIF" (PDF). J. Molecular Spectroscopy. 170 (1): 82. Bibcode:1995JMoSp.170...82Z. doi:10.1006/jmsp.1995.1058.
  8. ^ Schroeder, Melanie. Eigenschaften von borreichen Boriden und Scandium-Aluminium-Oxid-Carbiden (PDF) (in German). p. 139.
  9. ^ Tetrazoles contain a pair of double-bonded nitrogen atoms with oxidation state 0 in the ring. A Synthesis of the parent 1H-tetrazole, CH2N4 (two atoms N(0)) is given in Henry, Ronald A.; Finnegan, William G. (1954). "An Improved Procedure for the Deamination of 5-Aminotetrazole". Journal of the American Chemical Society. 76 (1): 290–291. doi:10.1021/ja01630a086. ISSN 0002-7863.
  10. ^ The compound NaCl has been shown in experiments to exists in several unusual stoichiometries under high pressure, including Na3Cl in which contains a layer of sodium(0) atoms; see Zhang, W.; Oganov, A. R.; Goncharov, A. F.; Zhu, Q.; Boulfelfel, S. E.; Lyakhov, A. O.; Stavrou, E.; Somayazulu, M.; Prakapenka, V. B.; Konôpková, Z. (2013). "Unexpected Stable Stoichiometries of Sodium Chlorides". Science. 342 (6165): 1502–1505. arXiv:1310.7674. Bibcode:2013Sci...342.1502Z. doi:10.1126/science.1244989. PMID 24357316. S2CID 15298372.
  11. ^ Mg(0) has been synthesized in a compound containing a Na2Mg22+ cluster coordinated to a bulky organic ligand; see Rösch, B.; Gentner, T. X.; Eyselein, J.; Langer, J.; Elsen, H.; Li, W.; Harder, S. (2021). "Strongly reducing magnesium(0) complexes". Nature. 592 (7856): 717–721. Bibcode:2021Natur.592..717R. doi:10.1038/s41586-021-03401-w. PMID 33911274. S2CID 233447380
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  13. ^ Unstable carbonyl of Al(0) has been detected in reaction of Al2(CH3)6 with carbon monoxide; see Sanchez, Ramiro; Arrington, Caleb; Arrington Jr., C. A. (December 1, 1989). "Reaction of trimethylaluminum with carbon monoxide in low-temperature matrixes". American Chemical Society. 111 (25): 9110-9111. doi:10.1021/ja00207a023. OSTI 6973516.
  14. ^ Dohmeier, C.; Loos, D.; Schnöckel, H. (1996). "Aluminum(I) and Gallium(I) Compounds: Syntheses, Structures, and Reactions". Angewandte Chemie International Edition. 35 (2): 129–149. doi:10.1002/anie.199601291.
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  33. ^ Ga(−3) has been observed in LaGa, see Dürr, Ines; Bauer, Britta; Röhr, Caroline (2011). "Lanthan-Triel/Tetrel-ide La(Al,Ga)x(Si,Ge)1-x. Experimentelle und theoretische Studien zur Stabilität intermetallischer 1:1-Phasen" (PDF). Z. Naturforsch. (in German). 66b: 1107–1121.
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  38. ^ A Se(0) atom has been identified using DFT in [ReOSe(2-pySe)3]; see Cargnelutti, Roberta; Lang, Ernesto S.; Piquini, Paulo; Abram, Ulrich (2014). "Synthesis and structure of [ReOSe(2-Se-py)3]: A rhenium(V) complex with selenium(0) as a ligand". Inorganic Chemistry Communications. 45: 48–50. doi:10.1016/j.inoche.2014.04.003. ISSN 1387-7003.
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  40. ^ Br(II) is known to occur in bromine monoxide radical; see Kinetics of the bromine monoxide radical + bromine monoxide radical reaction
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  46. ^ Rh(VII) is known in the RhO3+ cation, see Da Silva Santos, Mayara; Stüker, Tony; Flach, Max; Ablyasova, Olesya S.; Timm, Martin; von Issendorff, Bernd; Hirsch, Konstantin; Zamudio‐Bayer, Vicente; Riedel, Sebastian; Lau, J. Tobias (2022). "The Highest Oxidation State of Rhodium: Rhodium(VII) in [RhO3]+". Angew. Chem. Int. Ed. 61 (38): e202207688. doi:10.1002/anie.202207688. PMC 9544489. PMID 35818987.
  47. ^ Palladium(V) has been identified in complexes with organosilicon compounds containing pentacoordinate palladium; see Shimada, Shigeru; Li, Yong-Hua; Choe, Yoong-Kee; Tanaka, Masato; Bao, Ming; Uchimaru, Tadafumi (2007). "Multinuclear palladium compounds containing palladium centers ligated by five silicon atoms". Proceedings of the National Academy of Sciences. 104 (19): 7758–7763. doi:10.1073/pnas.0700450104. PMC 1876520. PMID 17470819.
  48. ^ Ag(0) has been observed in carbonyl complexes in low-temperature matrices: see McIntosh, D.; Ozin, G. A. (1976). "Synthesis using metal vapors. Silver carbonyls. Matrix infrared, ultraviolet-visible, and electron spin resonance spectra, structures, and bonding of silver tricarbonyl, silver dicarbonyl, silver monocarbonyl, and disilver hexacarbonyl". J. Am. Chem. Soc. 98 (11): 3167–75. doi:10.1021/ja00427a018.
  49. ^ Unstable In(0) carbonyls and clusters have been detected, see [1], p. 6.
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