The possible oxidation states for platinum are... +1, +2, +3, +4, +5, +6.
Platinum is connected to two anionic Chloride ligands and two neutral Ammine ligands Platinum = +2 oxidation state Chlorine = -1 oxidation state Nitrogen = -3 oxidation state Hydrogen = +1 oxidation state
the oxidation states are always 0 for both atoms
Mg = +2 oxidation state P = +5 oxidation state O = -2 oxidation state
Preferably in modern nomenclature, by capital "Roman numerals" within parentheses immediately following the name of a transition metal element cation in a chemical compound. For transition metal elements that have only two common cationic oxidation states, the oxidation states can alternatively be indicated by the suffix "ic" for the more positive oxidation state and "ous" for the less positive ones. Examples are "ferric" for "iron (III)" and "ferrous" for "iron (II)". If the transition metal is in an anion, the most common indication is with suffixes and prefixes, but the appended oxidation state in parentheses can also be used. Details may be different for different transition metals and should be sought in an authoritative reference source.
iron exhibits two oxidation states. one is Fe(II) and other Fe (III)
The most common oxidation states for Platinum is +2 and +4.
+2 and +4 are the more common ones
Green in its II and III oxidation states and orange in its VI oxidation state.
Platinum tetrachloride - PtCl4 The oxidation number is not of platinum tetrachloride but of the platinum ion in this compound - equal to 4+.
Cobalt is a transition metal. Its oxidation states are 2 (3).
Technetium oxidation states are between -1 and +7; the most common are 4,5 and 7.
Platinum is connected to two anionic Chloride ligands and two neutral Ammine ligands Platinum = +2 oxidation state Chlorine = -1 oxidation state Nitrogen = -3 oxidation state Hydrogen = +1 oxidation state
Technetium can have oxidation states ranging from -3 to +7. However, the most common and stable oxidation state for technetium is +7.
-1, 0, 1, 3 and 5 oxidation states The most common is 0 (its unreacted state)
The most common oxidation states of platinum are +2 and +4. The +1 and +3 oxidation states are less common, and are often stabilized by metal bonding in bimetallic (or polymetallic) species. As is expected, tetracoordinate platinum compounds tend to adopt 16-electron square planar geometries. While elemental platinum is generally unreactive, it dissolves in aqua regia to give soluble hexachloroplatinic acid ("H2PtCl6", formally (H3O)2PtCl6·nH2O ) Pt + 4 HNO3 + 6 HCl → H2PtCl6 + 4 NO2 + 4 H2O As a soft acid, platinum has a great affinity for sulfur, such as on dimethyl sulfoxide (DMSO); numerous DMSO complexes have been reported and care should be taken in the choice of reaction solvent. source: Wikipedia
They have multiple oxidation states (owing to the d orbital)
The oxidation number for an element by itself is 0. The oxidation number Np could have in a compound depends on what other elements it is bonded with. One common online periodic table lists the most common oxidation number for Np in compounds as +5, and less common states as +3, +4, +6, and +7.