What occurs when zero visibility is caused by heavy snowfall combined strong updrafts and downdrafts

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!

How does nathan’s hypothesis lead to new investigations

Of the following elements, which is the least reactive? a. c b. h c. li d. he