Generally for group 16 elements, like oxygen, sulphur, selenium.
the most common oxidation number for oxygen is -2.
Zinc will be 2+ in most cases.
The common oxidation number of manganese are +2, +4 and +7.
The most common oxidation number of magnesium is +2.
The most common oxidation number is +II. The charge and number for cobalt is +2.
The only oxidation number is 2+.
Cobalt is a transition metal. Its oxidation states are 2 (3).
The most common oxidation number for nickel is +2. Nickel is a transition metal that can also exhibit oxidation states of +1, +3, and +4, but the +2 oxidation state is the most stable and commonly observed.
Oxidation number of Se is +6. Oxidation number of O is -2.
The oxidation number of platinum is typically +2 or +4. Platinum is known to form compounds where it exhibits these oxidation states.
It depends on the compound. +1 and +2 are the more common ones (as in Cu2I2 and CuI2 respectively). In elemental form, its oxidation number is zero.
The most common oxidation states for tungsten are +2, +4, and +6.