Chemistry plzzz help. Will mark as brainliest.

Which statement justifies that phosphine (ph3) is a polar molecule?

How can one make a supersaturated solution? (apex)

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!