If 20.0 mL of a 0.010 M calcium hydroxide solution is necessary to neutralize 12.0 mL of a hydrochloric acid solution. Determine the molarity of the hydrochloric acid solution.

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!