The development of atomic theory

Determined that most of the atom is empty.

• J,J Thomson

• Democritus

• Rutherford

• Dalton

• Niels Bohr

Worked extensively with cathode ray tubes decipher the structure of the atom

• J.J Thomson

• Democritus

• Rutherford

• Dalton

• Niels Bohr

Coined the word "atom"

• John Dalton

• Democritus

• J.J Thomson

• Niels Bohr

• Rutherford

As an atom is neutral, the number positive charges in the nucleus (the number of protons) must be the same as that electrons.

• Modern atom

• J.J Thomson

• John Dalton

• Niels Bohr

• Rutherford

All matter is composed of extremely small particles called atoms.

• Niels Bohr

• J.J Thomson

• John Dalton

• Rutherford

• Democritus

Plum pudding model of the atom

• Niels Bohr

• J.J Thomson

• Rutherford

• Modern atom

• Democritus

The energy level at which electrons circulate is called the atomic shell.

• Rutherford

• Niels Bohr

• Modern Atom

• J.J Thomson

• John Dalton

The electronic structure of the atom as the probability of finding electrons within certain regions of space (orbitals).

• J.J Thomson

• Rutherford

• Modern Atom

• Niels Bohr

• John Dalton

If the electrons are given energy, the electrons in an atom could absorb energy by jumping to a higher energy level, or excited state.

• Niels Bohr

• John Dalton

• J.J Thomson

• Modern atom

• Democritus

Atom is a sphere in which the positive charges spread out evenly in the atom are neutralized by the negative charges positioned among the positive charges.

• Rutherford

• John Dalton

• Niels Bohr

• J.J Thomson

• Modern atom