science

Democratus

460

First to discover an atom and called it an atom because he believed it to be unbreakable in small parts

Dalton

Nov 2, 1803

He discovered that all atoms are indestructible and intangible. Also found that element are made of these tiny atoms. Dalton found that each atom in one element differs from the other elements.

Goldestin

Nov 2, 1886

Discovered the Canal Rays that will move in the opposite direction of the electrons. This discovery lead to the findings of a proton.

Thomson

Nov 2, 1897

He discovered electrons and noticed the capibility of atoms dividing. There was a also a discovery of him finding that atoms are made of postive and negatively charged particles.

Planck

Nov 2, 1900

He discovered the quantum theory which is the study of matter and radiation in a tiny particle called an atom. It is credited for the revolution of electrons round the nucleus.

Millikan

Nov 2, 1906

He determined the unit charge of the electrons, which gave us the electrons Mass too. This was shown by measuring a drop of oil that is suspended between capacitor.

Rutherford

Nov 2, 1913

He discovered the planetary model that had all the protons in the nucleus and the electrons orbitals around the nucleus like the solar system. Also, discarded the plum pudding model.

Bohr

Nov 2, 1913

Discovered the model that has a tiny positively charged nucleus, which contains proton and neutron that is hovered by negatively charged electrons. He was the first to discover that these electrons travels in separate orbits which determines the property of the element.

Heisenburg

Nov 2, 1927

Calculated the behavior of electron that helps the better understanding of pattern of an atoms electron. Also created the Quantum mechanics, which is used for understanding the behavior of atoms.

Debroglie

Nov 2, 1929

Presented the Wave Mechanic theory – improved the understanding of the physical nature on the atomic scale. He believed electrons can act like particle and waves.

schrodiger

Nov 2, 1932

Presented that electrons are constantly moving and are not a fixed position on the atom. An electrons is given a region called an orbital, which orbits the nucleus in the same pattern all the time

Chadwick

Nov 2, 1932

First person to discovered the neutrons which is believe to be a complex particle of a proton and electrons. later proven that proton and electrons pairing is impossible.

Aristotle

Mar 2, 2022

He did not believe that all materials
on Earth where made of atoms, but of fire, water, and air. His theory had a big following that prevented Democritus ideas of all substances came from atoms.