Key Contributions to Atomic Theory & Electromagnetic Spectrum

What did John Dalton contribute to atomic theory?

proposed the atomic theory, which states that matter is composed of indivisible atoms, each with a specific weight and that compounds are formed by the combination of different atoms.

What was Ernest Rutherford's contribution to atomic theory?

is known for the Rutherford model of the atom, which introduced the concept of a small, dense nucleus surrounded by orbiting electrons, based on his gold foil experiment.

What did J.J. Thomson discover in atomic theory?

discovered the electron and proposed the 'plum pudding model,' which suggested that atoms are composed of a positive 'soup' with negatively charged electrons embedded within it.

What is Niels Bohr known for in atomic theory?

developed the Bohr model of the atom, which introduced quantized energy levels for electrons, explaining how electrons orbit the nucleus at specific distances.

What was Erwin Schrödinger's contribution to atomic theory?

developed the quantum mechanical model of the atom, which describes electrons as wave functions and introduced the concept of electron clouds rather than fixed orbits.

List the waves of the electromagnetic spectrum in order of increasing energy.

Radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, gamma rays.