What is the concentration of a solution in ppm when 1.8x10-5 g fluoride is dissolved into 100 g of water?

Write a paragraph that provides examples of each stage of volcanic activity, a description of the volcano, and facts about each stage.

Label a-f based on the table using c for concentrated and d for dilute

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!