I noticed someone asked ‘how many atoms in a cow’ and i decided to ask you: What is an atom? :3

Question: I noticed someone asked 'how many atoms in a cow' and i decided to ask you: What is an atom? :3
- Keywords:
  atom,
  chemistry
Asked by anon-192243 to Kelly on 14 Nov 2018.
- Kelly Rushton answered on 14 Nov 2018:
  
  It is the smallest particle of a chemical element that can exist

Question: I noticed someone asked 'how many atoms in a cow' and i decided to ask you: What is an atom? :3