Particle of a chemical element (4)

I believe the answer is:

atom

(Other definitions for atom that I've seen before include "Small particle of matter" , "Very small object or amount" , "An explosive particle as in bomb" , "A mighty physical particle or bomb" , "Minute fragment" .)

I've seen this clue in The Times.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.