What processes and involved in the creation of sedimentary rock? Please help

How many grams of mgbr2 are needed to produce 75g or metal?

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!

How do you interpret a chromatogram for what mixtures contain?