Three Parts of an Atom: Protons, Neutrons, and __
This page is the CodyCross answer for the clue below from California, Group 1147, Puzzle 1 (Theme Parks).
Question is: Three Parts of an Atom: Protons, Neutrons, and __
and the answer is: ELECTRONS
Word Meaning:
ELECTRONS — plural of electron
Definitions from Wiktionary.