-
The Alchemists were a group of people discovered that all metal contained mercury and sulfur. They also discovered that metal can turn into gold. -
Democritus discovered that atoms make up all material things. -
Plato discovered that the ideal geometric forms serve as atoms. -
Robert Boyle discovered that substances cannot be broken down without breaking something else. -
Antone Lavoiser discovered that oxygen was the key substance in combustion. -
John Dalton created this model by using billiard balls as atoms. He wanted to show that the atoms were small.
-
John Dalton discovered that all matter has atoms. -
Amadeo Avogadro discovered that atoms could exist in the form of molecules. -
Dmitri Mendeleev discovered the periodic classification of elements. -
Neils Bohr discovered the theory of atomic structure:which states that all atoms look different. -
Pierre proved the existence of positively, neutral, and negatively charged ions. Marie discovered the radioactive elements polonium and radium. -
JJ Thompson discovered the electron. -
The Plum Pudding Model was discovered by JJ Thompson and showed electrons surrounded by a volume of positive charge. -
Albert Einstein proved the existence of atoms. -
Robert Millikan discovered the value of electron charge. -
The Solar System Model was discovered by Neils Bohr and showed electrons orbiting the nucleus.
-
Henry Mosely discovered the basis of the periodic table. -
Ernest Rutherford discovered that atoms consist of mostly empty space. He discovered that the mass is mostly in the nucleus. -
Erwin Schrodinger calculated energy levels of electrons. -
The Electron Cloud Model was discovered by Erwin Shrodinger and shows electrons surrounding the nucleus. It also shows that it is hard to find the exact location of the electron. -
Werner Heinsberg discovered the theory that states that the exact position of a particle cannot be found. -
James Chadwich discovered the neutron.
