Science 10 Scientisits Chemistry

Scientific Method

The process that is used in scientific discoveries

Dalton

Atomic Theory. If you kept dividing an element, at some point it would get to the smallest point at which it would be indivisible. (Hence, the atom.) His diagram was a solid, microscopic sphere.

J.J. Thomson

Created the “Raisin bun” model Credited with the discovery of electrons, Discovered that an atom is a sphere (which is positive) with negative electrons embedded in it– like raisins in a bun.

Ernest Rutherford

Discovered the Neucleus. that atoms have a nucleus that is positive and accounts for most of the mass. Most of the atom is actually empty space occupied by moving negatively charged electrons. Proposed the idea of protons. Gold Sheet dude.

Niels Bohr

Created the Planitary Model. Discovered that electrons move in circular orbits around the nucleus and cannot exist between orbits. Problems: electrons actually behave like waves and aren’t stuck in one place.

James Chadwick

Neutrons. Showed that the nucleus must contain heavy neutral particles to account for all the atom’s missing mass.

Schrodinger de Broglie

Created the Quantum mechanical model. Discovered that electrons have distinct energy levels. Exact locations of electrons are not defined, but the probable location in a region of space can be predicted. (Cloud Model.)

Dimitri Mendeleev

Created the periodic table of elements