-
400
Democritus is born.
Democritus, the Greek philosopher who searched for the description of matter over 2400 years ago, is born. He had a theory in which is said that the atom would have an end when being sliced/seperated. The final piece of matter would be named "Atmos". -
Jan 1, 1500
The Alchemists
The Alchemists were a group of people which discussed many things. They tried to make gold from ordinary metals/tin. They also turned base metals into noble metals. -
John Dalton discovers the atomic theory of matter.
Dalton came up with his own atomic theory also, but he discovered something big. He actually discovered the atomic theory of matter, which means he was the one that found out that all matter is made of atoms. He also said that atoms can neither be created nor destroyed. -
J.J. Thomson discovers the electron.
J.J. Thomson discovers the electron. He found out that there are smaller particles inside an atom. They were called "Protons and Electrons". -
Neils Bohr redefines Rutherford's theory.
Neils Bohr redefined Rutherford’s theory of the nucleus. He said that the protons and electrons orbit the nucleus without losing any energy at all. Also, electrons with lower energy orbit closer to the nucleus than the ones with higher energy. -
Ernest Rutherford discovers the nucleus.
Ernest did an experiment where he shot a beam into some gold foil and expected it to go right through. But instead, it bounced off in separate directions and he was very shocked, therefore he discovered the nucleus. A few years later, he did another experiment with two other scientists, and discovered more about the nucleus. It turns out that the protons and electrons which were discovered by J.J. Thomson were orbiting the nucleus inside the atom.
