3. The total pressure of helium and Argon gas in a closed cylinder is 3.0 atm. If the partial pressure of the Argon is 0.365 atm, what is the partial pressure of the helium?​

I'm learning about the periodic tables and what each subject's configuration is. for example, hydrogen is 1s^1, but i don't understand how you get that. can someone me understand how to figure out how to figure this out? sorry if the question makes no sense, but it would really a lot if you could me understand! you so much if you can!