An unknown element, x, reacts with rubidium to form the compound rb2x. in other compounds this element also can accommodate up to 12 electrons rather than the usual octet. what element could x be?

In what environment would mineral formation caused by high pressures and high temperatures most likely occur?

Complete each row of the table below by filling in the missing prefix or missing exponent.

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!