Atom Timeline by Banks Hardin

Democritus (460-370 BC)

hardinbankst — 2025-08-21 17:32:20 UTC

Came up with the idea that matter is composed of tiny particles called "atomos." He didn't go into further detail on atoms, and the location was Ancient Greece.

John Dalton (1803)

hardinbankst — 2025-08-21 17:33:13 UTC

Made the Atomic Theory, says that elements consist of atoms, which have specific weights and can't be seen. He came up with how atoms have different masses based on the element, and combine with each other in ratios. The location was in England.

Joseph Thompson (1897)

hardinbankst — 2025-08-21 17:33:37 UTC

Discovered electrons and made the "Plum Pudding Model" of the atom. Stated that electrons were negatively charged with low mass. The location was in England.

Ernest Rutherford (1911)

hardinbankst — 2025-08-21 17:33:51 UTC

Proposed the Nuclear model after he made a gold foil experiment. Discovered that the nucleus was a small, positively charged, dense part of an atom that had electrons orbiting it. The locations were New Zealand and England.

Niels Bohr (1913)

hardinbankst — 2025-08-21 17:34:09 UTC

Developed the Bohr Model, which came up with energy levels for electrons. States that electrons orbit the nucleus at certain distances, and the energy increase as the distance does. The location was denmark.

Erwin Schrodinger (1926)

hardinbankst — 2025-08-21 17:34:40 UTC

Developed the Quantam Mechanical Model. States that electrons were found on different orbits and that they couldn't be exactly located. The location was Austria

Photo of Models

hardinbankst — 2025-08-21 17:49:47 UTC

hardinbankst — 2025-08-21 17:50:56 UTC