atomic models

john dalton

dalton atomic theory

• elements made of atoms

• atoms of one element are identical while atoms of different elements are different

• atoms can’t be subdivided, created, or destroyed

• in chemical reactions, atoms are combined, separated, and rearranged

solid sphere model

atoms are tiny, indivisible solid spheres with no internal structure

J.J. thomson

• discovered electrons using cathode ray tubes

• atoms are divisible and contain smaller particles within them

plum pudding model

• sea of positive charge (pudding)

• dispersed electrons (plums)

ernest rutherford

• gold foil experiment

nuclear model

• nucleus in center

niels bohr

planetary model

• nucleus in center

• electrons orbit around nucleus

erwin schrödinger

quantum model

• nucleus in center

• cloud of electrons