Learners explain historical findings such as Rutherford and Bohr's contributions, explain wave particle duality, and formulate Heinsenberg's uncertainty principle. They also draw s, p, and d orbitals, explain more historical findings,...

A well designed clear tutorial explaining the energies involved in the Bohr model of the atom. Illustrations add to the clearly presented equations.

Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site discusses the hydrogen atom and its relation to spectrum. Included in the discussion is information on the Bohr model...

An outstanding site that can best be described as student friendly. It describes the main differences between the classical and quantum models of the atom. Clear and well illustrated.

A very lengthy page from friesian.com discussing Bohr's theory of electronic energy levels and the explanation of commonly observed atomic emission line spectra. The concept of a photon and Einstein's observation of the photoelectric...

Acting as a subtopic of the General Chemistry Virtual Textbook's section on Atoms and the Periodic Table, this site discusses Niels Bohr and his work with the atom. Topics covered in the discussion include the atom before Bohr, Bohr's...

Article explains the experiments on the photoelectric effect and how these experiments led to the idea of light behaving as a particle of energy called a photon.

Fact-Index.com offers a brief dictionary definition of the Balmer series, including hyperlinked terms.

Fact-Index.com offers a dictionary definition of the Paschen series, including hyperlinked terms.