History of the Atom

Democritus

430

Inventor- Democritus
Pro- He introduced the idea that thew atom as the smallest particel of an element.
Con- He didn't know about negatie and positive energy.

John Dalton

Nov 13, 1808

Invented- John Dalton
Pro- Inferred that atoms have ceartain characteristics, for example:
1. Elements are made of extremely small particles called atoms
2. Atoms of a given element are identical in size, mass, and other properties; atoms of differen't elements differ in size, mass, and other properties.
Con- We know now that atoms aren't a single solid, indestructable ball.

J. J. Thomson

Nov 13, 1897

Pro- Atoms contain positively and negatively charged particles.
Con- Thomson's model is drawn incorrectly because the negative particles are imbedded in the surface of tthe positive sphere.

Ernest Rutherford's Atomic Theory

Nov 13, 1911

Inventor- Ernest Rutherford
Pro- Rutherford descoverd that an atom did not have specific orbits of electrons, but more random and spread out.
Con- The modern model of an atom is much differen't from Rutherford's model, as we know now that an atom consists of proton snad neutrons in a nucleus sourounded by negativly charged eletrons.

Niels Bohr

Nov 13, 1913

Inventor- Niels Bohr
Pro- Bohr descovered that electrons have specific orbits around the nucleus.
Con- Bohr did not yet know about neutrons thus, his model was later proven wrong.

Wermer Heisenberg's Uncertainly Principle

Nov 13, 1925

Inventor- Wermer Heisenberg
Pro- describing how the quantum junmps occur. It did so interpreting the physical properties of particles as matrices that evolve in time.
Con- The uncertainly principle of quantum mechanics is intuitive to a certain extent and is only one of a few primary foundation principles of Quantum Theory. Myabe its the wording and formulation may need to be changed in the future.

Erwin Schrodinger Atomic Theory

Nov 13, 1926

Inventor Erwin Schrodinger
Pro- The advantage of this model is that it consists of mathematical equations known as wave functions that satisfy the requirements placed on the behavior of electrons.
Con- The disadvantage is that it is difficult to imagine a physical model of electrons as waves.

James Chadwick

Nov 13, 1932

Inventor- James Chadwick
Pro- Descovered Neutron
Con- James Chadwick did not have the technologies that we have today.