Structure of an Atom

Came up with the first idea of an atom. These atoms, he believed, were eternal and invisible; absolutely small, so small that their size cannot be destroyed. They absolutely full and incompressible, as they are without pores and entirely fill the space they occupy; and homogeneous, differing only in shape, arrangement, position, and magnitude.

Created the modern idea of atoms (the Atomic Theory). All atoms are the same but some properties were slightly different.
-All atoms of a given element are identical.
-The atoms of different elements vary in mass and size.
-Atoms are indestructible. Chemical reactions may result in their rearrangement, but not their creation or destruction.

Credited with the discovery of the Electron. He demonstrated that cathode rays were negatively charged. In addition, he also studied positively charged particles in neon gas. He created a model of the atom with plum pudding. The negative electrons represented the raisins in the pudding and the dough contained the positive charge.
-He did this using a cathode ray tube, which is a vacuum-sealed tube with a cathode and anode on one end that creates a beam of electrons travelling towards the other end of the tube.

He was the first to split an atom.
-Gold Foil Experiment.

- According to him practically the whole mass of the atom and at the same time all positive charge of the atom is concentrated in a minute space at the center.

Was able to create the pictures of a Nucleus, and the electrons in an atom
But was completely wrong
-he proposed that energy levels of electrons are discrete and that the electrons revolve in stable orbits around the atomic nucleus but can jump from one energy level to another.
-Bohr Model

How electrons move around atoms
-Electron Cloud Model
-Schrödinger used mathematical equations to describe the likelihood of finding an electron in a certain position. This atomic model is known as the quantum mechanical model of the atom.
-He figured out there is no direct path of an atom or electron

Chadwick bombarded beryllium atoms with new particles. And an unknown radiation was produced. Chadwick figured out this radiation was being composed of particles with a neutral electrical charge and the approximate mass of a proton. This particle became known as the neutron.

French Physicist who developed a revolutionary theory of electron waves. De Broglie’s idea of an electron with the properties of a wave offered an explanation of the restricted motion.

Came up with the uncertainty

-He was one of the main scientists when they made the atomic bomb
- He was still in school when they split the first atom.
-He saw that atomic bombs were only the first step on a terrible path. People would look for more powerful bombs - the idea of the hydrogen bomb had already been conceived; made people extremely interested in what else they could create.