What is quantum physics relationship to chemistry, the main theories?

There is a connection between the movements of electrons in molecules and atoms and their energies that is portrayed by quantum mechanics. As a result of wave-molecule duality, researchers must arrangement with the likelihood of an electron being at a specific point in space. To do so required the advancement of quantum mechanics, which utilizes wavefunctions (Ψ) to portray the numerical connection between the movement of electrons in particles and atoms and their energies. Wavefunctions have five significant properties: 

1. the wavefunction utilizes three factors (Cartesian axes x, y, and z) to depict the situation of an electron; 
2. the greatness of the wavefunction is relative to the power of the wave; 
3. the likelihood of finding an electron at a given point is relative to the square of the wavefunction by then, prompting a circulation of probabilities in space that is frequently depicted as an electron thickness plot; 
4. depicting electron conveyances as standing waves drives normally to the presence of sets of quantum numbers normal for every wavefunction; and 
5. each spatial appropriation of the electron depicted by a wavefunction with a given arrangement of quantum numbers has a specific energy. 

Quantum numbers give significant data about the energy and spatial circulation of an electron. The central quantum number n can be any certain whole number; as n increments for a molecule, the normal distance of the electron from the core likewise increments. All wavefunctions with a similar estimation of n comprise a chief shell where the electrons have comparable normal good ways from the core. The azimuthal quantum number l can have fundamental qualities among 0 and n − 1; it depicts the state of the electron appropriation. wavefunctions that have similar estimations of both n and l comprise a subshell, comparing to electron appropriations that typically vary in direction instead of fit as a fiddle or normal good ways from the core. The attractive quantum number ml can have 2l + 1 fundamental qualities, going from −l to +l, and depicts the direction of the electron conveyance. Every wavefunction with a given arrangement of estimations of n, l, and ml depicts a specific spatial dispersion of an electron in a particle, a nuclear orbital.