history of the atom

Who created the solid sphere model?

Dalton

daltons model was made in

1804

Who created the plum pudding model?

Thomson

what year was thomsons model

1904

Who created the nuclear model?

Rutherford

what year was Rutherford’s model?

1911

Who created the planetary model?

bohr

what year was bohrs model

1913

Who created the quantum model?

Schrodinger

what year was Schrodinger’s model?

1926

what does atom mean in Greek?

atomos, indivisible

recognized atoms of a particular element differ from other elements

Dalton

what were electrons called when they were first discovered?

corpuscles

recognized electrons as Components of atoms

thomson

fired positively charged particles at gold foil

Rutherford

realized atoms were mostly empty, discovered nucleus.

Rutherford

realized positive charge was localized in the nucleus of an atom

Rutherford

stated that electrons reside in fixed energy levels

bohr

explained the emission spectra of some elements.¨ electrons have fixed orbit¨

bohr

shows electrons dont move around the nucleus in orbits, but in clouds where their position is uncertain

Schrodinger

what was the issue with Dalton’s model?

Atoms aren’t indivisible, they’re composed of subatomic particles

what was the issue with Thomson’s model?

Didn’t explain the nucleus

what was the issue with Rutherford’s model?

Didn’t explain why electrons remain in orbit around the nucleus

what was the issue with Bohrs model?

model didnt work well for heavier atoms because moving electrons should admit energy and collapse into the nucleus