What did Democritus believe about the structure of an atom?

Democritus and his mentor, Leucippus, did not agree with this idea. They believed that matter was made up of extremely small particles. They called these particles atoms or atomos, which comes from an ancient Greek word meaning 'indivisible'. These atoms were considered to be completely indivisible and eternal. read more

According to Democritus atoms were miniscule quantities of matter. Democritus hypothesized that atoms cannot be destroyed, differ in size, shape and temperature, are always moving, and are invisible. He believed that there are an infinite number of atoms. read more