Chemistry - History of the Atom

What did Democritus suggest?

Everything is made of tiny particles called atoms

What was Daltons model?

Atoms were tiny solid spheres and different elements had different atoms

What did J.J. Thomson discover?

The electron and plum pudding model

What was the plum pudding model?

A ball of positive charge with negative electrons embedded inside

What experiment did Rutherford carry out?

The gold foil alpha scattering experiment

What did Rutherford discover?

Atoms are mostly empty space within a small positive nucleus

What did Chadwick discover?

The neutron

What was the order of the history of the atom?

Democritus-idea of atoms, John Dalton-solid sphere model, J.J. Thomson-electron discovered + plum pudding model, Ernest Rutherford-nucleus, Niels Bohr-electrons in the shell, James Chadwick-neutron