You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: QUID PRO QUO-POURRI 
Clue: Give me this Northwest African mountain range & I'll give you a book of the same name where you might see it
the atlas mountains

Category: INITIALLY YOURS 
Clue: One of the founders of the NAACP was this sociologist & writer of "The Souls of Black Folk"
w.e.b. dubois

Category: ACADEMIA NUTS 
Clue: Theoretical physicist John Dalton stated firmly in 1803, "Thou knowest no man can split" one of these

atom