How many of the following elements have +3 as their most stable oxidation state in their compounds.
Al, Tl, Mn, **, P, Cr, Cu, Sc, Si
Most stable states :
| +1 state | Ti | | +2 state | Cu | | +3 state | Al, **,Cr,Sc | | +4 state | Si | | +5 state | P |
Most stable state of Mn is +2 in acidic medium and +4 in alkaline/ neutral media.
