What is an Atom? | Definition, Concept and Parts of an Atom

What is an atom? An atom is the smallest unit of particles that can exist as a single substance (chemical element), and that can intervene in a chemical combination. It consists of a nucleus that represents more than 99.9% of its mass, with a positive electrical charge equal to the number of protons, and electrons, … Continue reading What is an Atom? | Definition, Concept and Parts of an Atom