What is the element symbol for carbon atom

What energy is it when you flip on a switch on a lamp

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!

Write a balanced equation showing the formation of copper (ii) nitrite from its elements