Each period of the periodic table ends with:

alkali metals such as na, k, li, and cs
period 7 elements
group viiia elements
the oxygen family
seven orbital shells

plz me ; -;

Drag each label to the correct location on the chart. classify each reaction as endothermic or exothermic.

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!

Among the elements of the main group the first ionization energy increases