Which elements have the same number of energy shells (levels)? *

When svante arrhenius first proposed his acid-base theory, he was a doctoral candidate. his professors thought his ideas were unfounded. within a decade, the arrhenius theory of acid-base was widely accepted and praised within the scientific world. arrhenius defined acids as compounds having ionizable hydrogen and bases as compounds with ionizable a) barium. b) hydronium. c) hydroxide. d) oxygen.

Which scenario is most similar to the type of collision that gas particles have according to kinetic molecular theory

Who discovered a pattern to the elements in 1869?