Atomic theories

Ancient greeks/DALTON

-Atoms in constand motion (brownian motion) STILL TRUE

-atoms are hard solid indivisible (FALSE subatomic particles electrons etc)

JJ Thompson

-plum pudding

-NEGATIVE dispersed in POSITIVE base

-discovered electrons with CATHODE tube

-beam of particles emitted from a negative end of cathode composed of diff metals

regardless of metals ray was always the same

-showed that even though atoms were different subatomic electrons were all the same regardless of substance and existed in all elements

Rutherford

NUCLEAR MODEL

-fired positive alpha particles at gold foil

-most passed through but just a few bounced back, showing that the nucleus was positive and very small and that the atom contained a lot of empty space

Bohr

-planetary model

-electrons revolve around the nucleus

shrodinger

-quantum model

-electron cloud, electrons dont have a set path they move in waves