Question

Why are atoms considered the smallest particles of an element?

Answer 1

Atoms are considered the smallest particles of an element because they are the basic unit. They cannot be broken down into any smaller substance. 

Answer 2

They are considered the smallest part of an element because when you break down an element into smaller and smaller parts, theoretically when you reach thed smallest part and you cant break it any more, it will be one atom of whatever element you are breaking down.