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 »

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

The Danish physicist Niels Bohr developed a model of the atom that combined Ernest Rutherford's discovery of the nucleus with the quantum ideas proposed by Max Planck. This solved the problem of why the electrons did not... 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 »