Because ancient Greek thinkers such as Democritus lacked sophisticated technology and tools such as the microscope, his theory of the atom was due more to thought experimentation than to hard empirical observation, as us... More »

The first scientific experiment that indicated the existence of atoms was performed by John Dalton during the 1800s. These early experiments did not yield information regarding the atom's structure. The structure of atom... More »

Although the early Greek philosopher Democritus hypothesized the existence of atoms, it was not until the late 1800s that English physician J.J. Thomson proposed a model for the atom. J.J. Thomson discovered the atom bec... More »

Democritus, an ancient Greek philosopher, was not the first to propose an atomic theory, as his mentor Leucippus originally proposed it. Democritus adopted the theory, developed it further, and provided a more detailed a... More »

John Dalton did not discover the atom, as it was discovered by Democritus during the Greek era. John Dalton proposed the atomic theory. More »

www.reference.com Science Chemistry Atoms & Molecules

Although the early Greek philosopher Democritus hypothesized the existence of atoms, it was not until the late 1800s that English physician J.J. Thomson proposed a model for the atom. J.J. Thomson discovered the atom bec... More »

The atom as a concept dates back to around 460 B.C. when the ancient Greek philosopher Democritus originated both the idea and the name. Though the idea was largely ignored by subsequent philosophers of his era, the conc... More »