Which of the following elements has the largest known oxidation number (in magnitude)?

Sorry, here are the choices...

Pt, Au, Os, Fe, Ru

Thanks

Both Ru and Os have compounds in which the oxidation number of Ru and Os are +8.

To determine which of the given elements has the largest known oxidation number, we need to find the highest oxidation state for each element. Here's how you can approach this problem:

1. Look up the oxidation states for each element:
- Platinum (Pt) typically exhibits oxidation states from -2 to +4.
- Gold (Au) commonly has oxidation states from -1 to +5.
- Osmium (Os) is known to have oxidation states from -2 to +8.
- Iron (Fe) is well-known for oxidation states ranging from -2 to +6.
- Ruthenium (Ru) is generally found with oxidation states from -2 to +8.

2. Determine the largest oxidation number within the given range for each element:
- Pt's largest oxidation number is +4.
- Au's largest oxidation number is +5.
- Os's largest oxidation number is +8.
- Fe's largest oxidation number is +6.
- Ru's largest oxidation number is +8.

3. Comparing the values, we can see that osmium (Os) has the largest known oxidation number, which is +8.

Therefore, the element with the largest known oxidation number (in magnitude) among the given options is Osmium (Os).