Acompound is 19.4% calcium, 34.3% chlorine, and 46.3% oxygen. what is its empirical formula?

When the speed of the bottle is 2 m/s, the average maximum height of the beanbag is m.

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!

Achemical reaction is done in the setup shown, resulting in a change of mass. what will happen if the same reaction is done in a sealed container that is placed on the electronic balance?