Which of following show +8 oxidation stateOsMoMnW

The element that shows a +8 oxidation state among Os (Osmium), Mo (Molybdenum), Mn (Manganese), and W (Tungsten) is Osmium (Os).

Here's a step-by-step explanation:

1. Oxidation state refers to the degree of oxidation of an atom in a chemical compound. It represents the number of electrons that an atom loses or gains when forming a chemical bond in a compound.

2. The maximum oxidation state can be determined by the number of valence electrons (electrons in the outermost shell) that can participate in the formation of chemical bonds.

3. Among the given elements, Osmium (Os) is the only one that can exhibit an oxidation state of +8. This is because it has 8 electrons in its outermost shell (6 in the 5d subshell and 2 in the 6s subshell) that can participate in bond formation.

4. The other elements - Molybdenum (Mo), Manganese (Mn), and Tungsten (W) - cannot reach an oxidation state of +8. Molybdenum and Tungsten can reach a maximum oxidation state of +6, while Manganese can reach a maximum oxidation state of +7.

So, the correct answer is Osmium (Os).