-
340
Aristotle
He believe that atoms were at a constant stand still -
440
Democritus
Found that there is no way to cut an atom -
Robert Boyle
He studied gasses and found that they were groups of particles. These groups created many substances. -
Antoine Lavoisier
He created the unison language for science. This helped advancments and limited confusion. -
John Dalton
He brought up the theory that the reson elements were clusters of atoms. These atoms could not be destroyed, there were multiple types of elements, and that they created new substances when combined with old substances. -
J.J. Thomson
He wrongly thought there were smaller particles in the atom. He did however find that some atoms could be negatively charged. -
Hantaro Nagoaka
Though his model was wrong, Nagoaka did discover the rings around atoms -
Ernest Rutherford
He proved the plum pudding model wrong with a sheet of gold foil and positively charged particles. He then created a new model. -
James Chadwick
Chadwick had discovered the neutron. He saw it as a small particles inside the nucleus that was similar to the proton. -
John Douglas Cockcroft and Ernest Thomas Sinton Walton
They built a linear accelerator. And produced alpha particles by infesting lithium with protons. They then split the atom for the first time and later lead to the atomic bomb that ended WW2. -
James Chadwick
He theorized the electron cloud. He saw it as the main area of moving particles. -
Enrico Fermi
He conducted the first release of energy from the atoms nucleus in a chain reaction. -
Glenn Seaborg
He puts together the modern periodic table. -
Crockroft and Walton
World War 2 was finished with an atomic bomb that was dropped.
Crockroft and Walton's idea was used by America to split the atom and create the nucleur bomb. -
Glenn Seaborg
He identified lanthanides and actinides (atomic number 92,
which are usually placed below the periodic table. -
Quantum Mechanical Model
The modern day model is one made up of different rings and what the atom consist of (energy levels, protons, and neutrons). It also includes the electron cloud and rings/paths. -
Neils Bohr
He discovered that electrons have predetermined pathes and even though they can not move in between the paths they can jump them.