Big idea A test

1808 Daltons atomic theory

Billiard ball model, Atoms exist, Subatomic particles not found

!904 Thomson Discovered electrons

Created the plum pudding model, Discovered electrons can be removed from atoms but protns were still unknown. Expirament, Cathade ray tube, particles went throught tube and if they were attracted to the posative magnet the were negative and vis versa.

1911 rutherford divcoved nucleus

Nuclear model, Discovered dense posative nucleus and atoms are mostly empy space. Expirament, Gold foil epirmament. Posative alpha shot though gold foil. 99% of particles didnt hit anyrthign therfore a atom is mostly empty space. Some particles were repelled, posative nucleus repelled by posative alpha partive alpha particles

1913 Borh Discoverd electons

Planetary model. Discovered electrons orbit, electrons can only be in certain spots. Expirament, light emmision spectra, Atoms emit light at only certain wave lengths, Energy correspond to a spesific distance from the nucleus

1926 Schrodinger discoverd quantum mechanics and the electon cloud

Discoved elctron could, Shells, subshells, orbitals, spirs. Epirament, Math- he is smarter than we are.