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Well, without being given an equation, we presume you mean the o.n. of chromium. H in this is +1, so H+H=+2 4 x O= -2 x 4 = -8, therefore Cr = +6 as the whole element has to equal zero. and i do believe in this form it normally goes to Cr +3
The most likely elements are iron, ruthenium, osmium, chromium, cobalt, nickel, molybdenum
Nitrogens oxidation number is plus five. Oxygen's number is minus two.
Oxidation number is +2 for Zn+2 ion
Mn increase in oxidation number from +4 to +7.
Potassium's minimum oxidation number is zero.Its maximum is plus one.
2-
-2
Carbon has +2 oxidation number in Carbon monoxide. It gets this oxidation number when it loses or shares two electrons.
oxidation number of S is +6.It oxidize into SO4 ^-2
Oxidation number is plus two. It is common to every ion of Ca.
Sodium - it goes from oxidation number 0 to +1