An atom is known as the smallest part of an element. It consists of a nucleus and electrons and matter is made up of atoms.

Democritus is a Greek Philosopher born 460 B.C. He formulated his own Democritus Atomic Model. His atomic theory states that everything is physically made op of atoms. He stated that atoms are indivisible and can never be broken down into pieces. He added that in between atoms are empty spaces, the more empty space the heavier the atom gets. This on the other hand was opposed and is only based on his opinions but not studied geometrically. Democritus Atomic Model talks about the atoms that can never be destroyed nor created.

Democritus believed that atoms are always moving and comes in different shapes and sizes. His theory states that all matter is made up of atoms and they are invisible. He stated that atoms are homogenous and that atoms are solid. Atoms cannot be destroyed nor created and changed. Atoms differ in size, shape, weight position and arrangement. They are space between atoms. Oil is made up of smooth solid atoms that can easily pass each other. Liquid has large round atoms and solids are made with pointy small solid atoms.

Democritus atomic model is made up with a sphere that cannot be seen or invisible. The sphere has no nucleus or electrons. They differ in shape, size and temperature. Democritus drew this model showing that atoms cannot be destroyed in any form or in any way.

Atomic theories of Democritus were opposed by other Greek philosophers such as Aristotle. He labeled Democritus ideas as worthless. Soon after more than 2000 years, nobody did explore and made experiments to prove and study further the composition of atom or matter.

It was the year 1800's John Dalton, English chemist conducted experiments that later proved and showed that matter is made up of various elements. In 1897, the electron was discovered by J.J. Thompson. He then made his own atomic model showing electron with the negative charge and thought about it to have positive charge too.

There are great scientist and chemists to have attempted to explore more about the structure of an atom and nearly predict or measure its movements. Large studies and experiments were conducted but nothing could deepen and explain further more. It remained until today the mystery of how an atom has its structure. We all know that it do exist.