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400
Democritus
https://www.youtube.com/watch?v=oWvBtbBH4rg
Democritus was a Greek philosopher who proposed that matter is made up of tiny indivisible, indestructible parts called atomos, from the English word atom which means indivisible. But later on he was proved to be wrong because now we know that atoms are made up of electrons, protons, and neutrons. -
John Dalton
https://www.youtube.com/watch?v=IdSUqsq1yY8
John Dalton discovered that everything is made up of atoms, all atoms of the same element are identical, compounds are made up of different atoms, and he discovered the nature of atoms -
Lord Ernest Ruthford
https://www.youtube.com/watch?v=Zd6_zVdMgJk
Lord Ernest Ruthford discovered that atoms are made up of a small positively charged nucleus. He also discovered that an atom is mostly just empty space. -
J.J Thompson
https://www.youtube.com/watch?v=JwdGFZA3WOs
J,J Thompson discovered the electron when he was experimenting with gas discharge tubes. The electron has a negative charge. He also discovered cathode rays. -
Niels Bohr
https://www.youtube.com/watch?v=wCCz20JOXXk
Niels Bohr made the Bohr model. He made the Bohr model similar to the solar system. The electrons keep spinning around the nucleus, like planets spin around the sun.
