Quote Originally Posted by Frontier View Post
Technically the first Atom was the Golden Age Atom, Al Pratt.

Ray Palmer was the Silver Age Atom ala Hal Jordan Green Lantern and Barry Allen Flash, and he's the one who coined the Atom's iconic costume and size-changing gimmick.

Ryan Choi is the third Atom who succeeded Ray.
To piggy back: The only thing that Al Pratt and Ray Palmer have in common is the name of , The Atom. Their power sets are completely different.