Wat two common uses for Sulfur??

Why does his teacher ask him to balance the equation by including the correct coefficient

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!

Rays from the sun are not considered matter true or false