Give the 4 quantum numbers for the highest energy electron in the valence shell of Osmium.
2 answers
Look up the electron configuration of Os; i.e., 1s2 2s2 2p6 3s2 3p6 3d10 .......That will give you the n value and the l value. With those you can finish. If you need further help, post what you can do and I can help you finish.
I looked up the electron configuration. It is Xe 4f14 5d6 6s2
The valence shell is the 6s2. Can you take it from here?
The valence shell is the 6s2. Can you take it from here?