What is the best description of a mechanical wave?
A. A mechanical wave transfers energy through matter.
B. A mechanical wave transfers energy through empty
space.
C. A mechanical wave has many vibrations.

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!

Which rate indicates the number of children that would be born per woman if she were to live to the end of her child bearing years

Do polar molecules have ionic bonds?