How is c10 h16 + 8 cl2+ 10c + 16 hcl written

Which statement best describes the function of enzymes?

Why is the melting of ice a physical change ?

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!