What is the correct noble gas configuration for strontium?

What is the relationship of air masses and the temperature of oceans?

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 many moles of bromine are needed to produce 3.23 moles of potassium bromide