Question

which is the smallest particle of matter?
a atom
b element
c proton
d pure substance

Explanation:

• An atom is the basic unit of matter.
• An element is a pure substance made of only one type of atom.
• A proton is a sub - atomic particle (part of an atom).
• A pure substance can be an element or a compound (made of molecules which are made of atoms).

Answer:

A. atom