Number of atoms in 10090 g Ne (PLEASE HELP!!)

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!

Why do lunar and solar eclipse not happen every month

Once similarity and one difference between a mixture of elements and a mixture of compounds