Physical Chemist.
Svante Arrhenius (1859–1927): Swedish physicist and chemist. He is considered to be one of the founders of physical chemistry. He received the Nobel Prize in Chemistry in 1903.
Source:
1.) Gordon Stein (1988). The encyclopedia of unbelief, Volume 1. Prometheus Books. p. 594. ISBN 9780879753078. "Svante Arrhenius (I859-I927), recipient of the Nobel Prize in chemistry (I903), was a declared atheist and the author of The Evolution of the Worlds and other works on cosmic physics."