Negatively Charged Particle, Not a Proton
This page is the CodyCross answer for the clue below from La Bella Roma, Group 416, Puzzle 3 (Villa Doria Pamphili).
Question is: Negatively Charged Particle, Not a Proton
and the answer is: ELECTRON
Word Meaning:
ELECTRON — (particle physics) The subatomic particle having a negative charge and orbiting the nucleus; the flow of electrons in a conductor constitutes electricity.
Definitions from Wiktionary.