Which information must be known about a compound to find the molecular formula from the empirical formula?

Which statement best describes the flow of energy in this scenario

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!

Which of the following is not an assumption that scientists must make about the natural world? a. regularity b. causality c. predictability d. plausibility