2. Chemical Properties

Electronic Shell

The electronic configuration of an atom is a description of the arrangement of electrons in circles around the core. These circles are not exactly round; they contain a wave-like pattern. For each circle the probability of an electron to be present on a certain location is described by a mathematic formula. Each one of the circles has a certain level of energy, compared to the core. Commonly the energy levels of electrons are higher when they are further away from the core, but because of their charges, electrons can also influence each another’s energy levels. Usually the middle circles are filled up first, but there may be exceptions due to rejections.
The circles are divided up in shells and sub shells, which can be numbered by means of quantities.

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