Which of the following is an excited state electron configuration? a) 2-8-2
b) 2-8-3
c) 2-6-1
d) 2-8

Using the periodic table, complete the table to describe each atom. type in your answers. a ? b? c? d? e? f?

Nonmetal halogen family atmoic mass 35

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!