is the oxidation number for platinum larger than the oxidation number for osmium?

The oxidation number of any element is zero; therefore, both Pt and Os have an oxidation number of zero if they are not in a compound.

To determine whether the oxidation number for platinum (Pt) is larger than the oxidation number for osmium (Os) in a compound, you need to refer to their positions in the periodic table.

Platinum is located in group 10, period 6 of the periodic table, while osmium is located in group 8, period 6. Both elements belong to the d-block or transition metals.

Transition metals can exhibit different oxidation states due to their ability to lose or gain electrons from their d orbitals. The maximum oxidation state for platinum is +6, while for osmium, it is +8.

However, it's important to note that in most compounds, transition metals have oxidation states that are less than their maximum values. To determine the precise oxidation states for specific compounds, you would need to refer to their respective chemical formulas and/or other contextual information.

So, without additional information about the specific compounds containing platinum and osmium, it is not possible to definitively say whether the oxidation number of platinum is larger than that of osmium.