Positively charged central core of an atom (7)

I believe the answer is:

nucleus

(Other definitions for nucleus that I've seen before include "Centre of an atom" , "part of comet's head" , "Core, centre" , "Central mass - kernel" , "Central mass of a cell" .)

I've seen this clue in The Guardian.

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.