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Topics: Electromagnetic Radiation

Quantum Mechanical Model

Quantum Mechanical Model

Subject: Chemistry
Bohr’s theory was a start but it only explained the hydrogen atom (one electron as a particle orbiting around a nucleus). The Quantum-Mechanical (QM) model, first developed by Erwin Schrodinger in 1926 describes electrons mathematically…
Interpreting Electronic Spectra

Interpreting Electronic Spectra

Subject: Chemistry
The simplest spectra to study are those of H, as it only has one electron. These contain sets of lines which can be related to the energy levels. The Lyman series (in the ultra-violet) correspond…
Moving Electrons

Moving Electrons

Subject: Chemistry
Moving an electron between a lower and higher energy level can only be achieved if it absorbs energy of a particular amount; this could be from a particular wavelength of light. Conversely if an electron…
Bohr Model

Bohr Model

Subject: Chemistry
Emission and absorption spectra are evidence that the electrons within an atom have quantised energies i.e. an electron cannot possess a continuous range of values for energy but must have specific values called energy levels.…
Absorption Spectra

Absorption Spectra

Subject: Chemistry
An element can also absorb light at specific wavelengths. An absorption spectrum can be obtained by passing a continuous radiation spectrum (white light) through a vapour of the gas. The absorption spectrum consists of a…

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