Atomic Theory

J.J. Thomson proposed that atoms contain negatively charged electrons embedded in a positively charged 'soup', known as the 'Plum Pudding' model.

A proton has a positive charge.

John Dalton discovered that every element consists of one type of atom.

J.J. Thomson is best known for his 'Plum Pudding' model of the atom.

A neutron has no charge (it is neutral).

The three main subatomic particles are protons (positive charge), neutrons (no charge), and electrons (negative charge).

The nucleus is the central part of an atom, containing protons and neutrons.

Ernest Rutherford discovered that atoms have a small, dense nucleus through his gold foil experiment.

A neutron has approximately the same mass as a proton.

Electrons are responsible for chemical bonding and reactions due to their negative charge and arrangement around the nucleus.