Mercury melts at 234.3 k. convert this this melting point to degrees celcius

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

Answer explain why it is not possible to deduce a complete order of reactivity.

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!