no, it does not exist
The example is Iron. It can have a -2 oxidation state, in a complex compound called Sodium Tetracarbonylferrate = Na2Fe(CO)4
Oxidation Number
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A metal and a nonmetal would form an ionic bond. In an ionic compound, a metal ion would have a positive oxidation number equal to its ionic charge. A nonmetal would have a negative oxidation number equal to its ionic charge.Examples:NaCl oxidation numbers: sodium has an oxidation number of +1, chloride has an oxidation number of -1. So the overall charge of NaCl is zero.CaCl2 oxidation numbers: calcium has an oxidation number of +2, the chloride ion has an oxidation of -1. Since there are two chloride ions, the total negative oxidation number is -2, so CaCl2 has an overall charge of zero.
Boron
No, there is no such compound
The example is Iron. It can have a -2 oxidation state, in a complex compound called Sodium Tetracarbonylferrate = Na2Fe(CO)4
There are some 'metals' that occasionally acquire a negative charge, Hydrogen is one such. However I have never heard Manganese doing this.
Oxidation Number
The compound has no charge. This means that the positive oxidation numbers must equal the negative oxidation numbers. Cl has an oxidation number of -1. Therefore, Zn must have an oxidation number of +1.
oxidation number
The oxidation number of oxygen in most compounds is -2.
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The compound has no charge. This means that the positive oxidation numbers must equal the negative oxidation numbers. 'H' always has an oxidation number of +1. There are three of these atoms in the compound giving +3. To cancel out this positive number, the 'B' must equal -3.
In the compound Co2O3 cobalt has an oxidation number of 3 while oxygen has an oxidation number is -2.
Flourine
Oxidation number is oxidation states of an element. It can be positive or negative.