because they are stable
why do alkali metels not show +2 oxidation state
Never. iron shows either +2 or +3 oxidation state but in Fe3O4 its oxidation state is seems to +4 but it is actually mixture of one moles FeO and one mole Fe2O3 , (FeO.Fe2O3 = Fe3O4).
Ruthenium and Osmium both show the oxidation state of +8, which is highest known for any single metal ion.
Because they have only one electron in their valency shell. The second oxidation state would require the atom to lose an electron from its penultimate shell which is full.
Outer most shell of Mn contain 2 electron in 4s orbital and 5 unpaired electron in 3d orbital hence in exiting state it has 7 unpaired electron. Thus It shown number of oxidation state................... 0, +2, +3, +4, +6, +7 etc.
why do alkali metels not show +2 oxidation state
When halogens bind to more electropositive elements (compared it itself), they show -1 oxidation state. When halogens bind to more electronegative elements (compared it itself), they show +1 oxidation state.
Due to the comparable energies of ns and the (n-1)d orbitals, the d-electrons also take part in the reactions.
It is rarely, but manganese can show the valence 5+.
Never. iron shows either +2 or +3 oxidation state but in Fe3O4 its oxidation state is seems to +4 but it is actually mixture of one moles FeO and one mole Fe2O3 , (FeO.Fe2O3 = Fe3O4).
All are radioactive and all of them can show the oxidation state of +3
Ruthenium and Osmium both show the oxidation state of +8, which is highest known for any single metal ion.
Because they have only one electron in their valency shell. The second oxidation state would require the atom to lose an electron from its penultimate shell which is full.
They show the oxidation an reduction halves of a reaction
Transition metals can move electrons between the outer shell and the d d orbital. For example, copper can either lose its 2 s electrons or move one of those s electrons into d orbital, which is one electron short of being full.
Oxidation is found by putting the unknown oxidation number as x and all other values of oxidation number are added, and are put equal to the total charge on the species. Any constiuents ion's oxidation number can be put equal to the charge. Oxygen always show -2 oxidation state except peroxide, AND superoxides, an other exception is also there i.e. OF2. Alkali metals always show +1 oxd state. Eartheline earth metal show +2 oxd state. Eg- In KMnO4, +1 for K, x for Mn, all O's with -2 each Thus, (+1) + (x) + (4*-2) = 0, 0 for KMnO4 is a neutral species. Here, x = +7. Oxd state or number of Mn in KMnO4 is 7. For more details, contact me at ishuswami@gmail.Com
Aluminium, Gallium,Indium, Thallium show O.S. of +3. Since Ununtrium is also placed in group 13, it might show O.S of +3 as well. In 3d transition series, Scandium,Titanium, Vanadium,Chromium,Manganese,Iron,Cobalt,Nickel show the oxidation state of three. In 4d transition series, Yttrium, Zirconium,Niobium, Molybdenum,Technetium,Ruthenium, Rhodium, Silver. In 5d transition series, Hafnium,Tantalum,Tungsten, Rhenium,Osmium,Iridium, Gold,Platinum show O.S. of +3. Also, All the Lanthanides elements show oxidation state of +3. Among the Actinides, Actinium, Protactinium, Uranium,Neptunium,Plutonium,Americium,Curium, Berkelium, Californium,Einsteinium,Fermium,Mendelevium,Nobelium and Lawrencium show oxidation state of +3. Apart from these, Meitnerium is also predicted to show O.S. of +3 .