it is a chromium 2
as a good point of reference, and if you don't know the specific charge of an atom, check the ion to which it is bound:
the phosphide ion is most commonly charged as a 3- ion because its period is has 3 electrons more than it needs to form a complete octet
2 phosphide ions (per your empirical formula) would have a total ionic charge of 6-
if you distribute the (6-) charge evenly through the 3 chromium ions in your empirical formula, then each chromium ion would have to have a charge of 2+ in order for the ionic salt to be neutrally charged.
therefore the chromium is chromium (II)
CrO has chromium in the 2+ oxidation state. Remember that oxygen is nearly always in the 2- oxidation state, and that must be balanced out in a compound.
It is Chromium III (3)
It is a chromium II
Cr2S3 is a chromium 3
Chromium II
II
It is a chromium III
Chromium (III) chloride
Chromium (II) Fluoride
the chemical formula for chromim(II) fluoride is CrF2
The name of CrCN2 is chromium(II) cyanide.
It is a chromium III
Chromium (VI) phosphate
Chromium (III) chloride
Chromium (II) Fluoride
the chemical formula for chromim(II) fluoride is CrF2
Cr2O3 is the chemical formula for chromium (III) oxide
Chromium (II) chloride = CrCl2Chromium (III) chloride = CrCl3 Chromium (IV) chloride = CrCl4
Chromium(II) nitrate: Cr(NO3)2Chromium(III) nitrate: Cr(NO3)3
CrO is the formula for chromium(II) oxide. Cr is the elemental symbol for chrome, and O represents oxygen. The molecular weight of CrO is 68.00 grams/per mole using two significant figures. Variants of CrO include II, III and VI.
The name of CrCN2 is chromium(II) cyanide.
Yes, it is a chromium III
That would be chromium(II) sulfate, but really, chromium mostly exists as Cr(III) or Cr(VI), which would change the formula.