Atomic Model Timeline

Aristotle's Atomic Theory In 335 BC, Aristotle created an atomic theory stating that there were only 5 elements of matter. The air was light, the earth was cool and heavy, water is wet, fire which is hot and aether, which was what he thought stars and planets were made of. A fact about him was that he taught Alexander the Great.

Democritus In 430 B.C., Democritus made the theory of atoms. Atoms (which means “unbreakable” in Greek), he says, are unseeable particles in all matter which includes an empty void.

Plato

Henry G.J. Mosely In 1913, a British scientist Henry G.J. Mosely was studying atomics. While he was studying he found something that totally changed the thought process. He discovered that the name of the property isn’t defined by the weight of it but by the number.

The Alchemists From 700-1500, there was a type of scientist that believed in something that was completely false. They thought that they can change substances into gold. A fact about The Alchemists founded by the writings of Hermes Trismegistus, his inspiration influenced science for 800 years.

Robert Boyle In 1670, Robert Boyle makes an interesting and new discovery. He found that atoms cannot actually cannot be broken down and that compounds are combinations of elements. He was even learning and discovering at 8, taking 3 languages at once.

John Dalton In 1670, Robert Boyle makes an interesting and new discovery. He found that atoms cannot actually cannot be broken down and that compounds are combinations of elements. He was even learning and discovering at 8, taking 3 languages at once. His discovery proved Democritus right along with many other Ancient Greeks.

Amedeo Avogadro In 1810, only 7 years after John Dalton’s discovery of compound breakdowns and the weight of atoms, Amedeo Avogadro discovers that an atom has two atoms of an element making water from HO to H20. Unfortunately it took scientists four years after his death to except his discovery.

Antoine Lavoisier In 1789, Antoine Lavoisier finds and proves Robert Boyle’s discovery that the mass of an object can never be changed, it can just change its form. He was later executed for being Anti-Royal.

J.J. Thomson In 1897, J.J Thomson, an English Scientists, discovers electrons. He decides that there is a positively charged sphere while the outside has negative electron who circle around. He became a master of Trinity College until his death.

Robert Millikan In 1923, Robert Millikan received a Nobel Prize for measuring the negative charge of atoms in electrons. He was the twenty third to win in Physics.

Ernest Rutherford In 1911, Ernest Rutherford discovered a center positive nucleus and a rotating around at great speeds.

Dmitri Mendeleev In 1789, Dmitri Mendeleev, a Russian scientist, showed the first atomic table, which was incorrectly made based off of mass. He also introduced the metric system to Russia.

Pierre and Marie Curie From 1890 to 1910, Pierre and Marie, who are married, studied and worked with radium to learn about radioactive elements. They soon discovered that they slowly lose their electrons over time. They later won a Nobel Prize for their work.

Albert Einstein Albert Einstein was known for many things. In 1905 he pushed the Theory of Relativity that explained the mass and energy in atoms.

Niels Bohr Niels Bohr discovered the number of outer shells with electrons that decide the chemical property. It was later named after him as the “Bohr Model”.