Asubstance that is made up of more than one kind of molecule is called a

What is the percentage composition of carbon in the compound ch4

What produces wave a)sound b) heats c)transfer of energy d)vibrations

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!