If the element was lead-210 with a half life of about 22 years, how old would this sample in the previous question be?

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!

What is the chemical equation of fire?

Mach the labels with the symbols on the weather map