Hello, friends today we will discuss the basic concept of chemistry it is our first tutorial series in which we will discuss: Atom Molecule Ion Molecular ion Now in this article, we will discuss atoms. Its definitions, examples, properties, its evolutionary history, and also some important facts in the form of questions. Atom Definitions A tiny particle that cannot be seen with a naked eye so-called atom. Or Atom is the lowest unit of matter and is often divided without the discharge of electrically charged particles. Or Atom is the introductory structure block of chemistry. Examples From molecule; Hydrogen (H 2 ) It has two atoms. Nitrogen (N 3 ) It has three atoms From elements; Helium(He) It has two electron Properties We discuss different properties of atoms like: Atomic no: The no of ...