Usually. There are carbonyl complexes such as K2Fe(CO)4 in which the metal has a negative formal oxidation state. John Ellis,
in Minnesota, did quite a bit of work on trying to make compounds with the most negative possible formal oxidation states on the metals (I almost did
a post-doc with him, but took a different offer first).
http://pubs.acs.org/doi/abs/10.1021/ja00448a021?journalCode=... has Mn(CO)4-3, which has a metal in its -3 oxidation state
(formally, at least, although much of the negative charge will actually be on the oxygens of the carbonyl ligands).
And then there are aurides, in which gold is int he -1 oxidation state:
http://www.fkf.mpg.de/134290/Aurides
[Edited on 12-5-2014 by DraconicAcid]
Please remember: "Filtrate" is not a verb.
Write up your lab reports the way your instructor wants them, not the way your ex-instructor wants them.
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