Light from Emission Spectra Emitted wavelength Emitted frequency Speed of light wave (m per second) Element (m) (Hz) Color of light hydrogen 4.34 x 107 6.91 x 104 violet hydrogen 4.86 x 10 6.17 x 104 blue helium 5.06 x 10 5.93 x 10" green sodium 5.69 x 10 5.27 x 104 yellow 4.98 x 10" orange neon 6.03 x 10 red hydrogen 4.57 x 104 6.56 x 10- Copyright O Savvas Learning Company LLC. A Rights Reserved Savvas is not responsible for any modifications made by end users to the content posted in s original fomat

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Quantum Chemistry

Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned towards the application of physical concepts towards various chemical aspects such as, formation of atoms, chemical structure descriptions, chemical bond strength, hybridization, conjugation etc. Quantum chemistry mainly studies the various states i.e., ground state, excited state, transition states of the individual atoms or molecules taking place during any chemical reaction. The laws of motion explained by various scientists, which are termed as “classical mechanics” were not acceptable in terms of electrons, protons, atoms, light etc. Thus, a new theory named “quantum mechanics” emerged to understand the basic framework of various atomic and subatomic particles.