N atomic physics and quantum chemistry the electron configuration is the distribution of electrons of an atom or molecule or other physical structure in atomic or molecular orbitals. The electron configuration of chlorine is illustrated below.
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It can be written as 1s 2 2s 2 2p 6 3s 2 3p 5 or as Ne3s 2 3p 5.
K 1 electron configuration.
L shell 8 electrons.
However there are numerous exceptions.
K shell 2 electrons.
For example the lightest exception is chromium which would be predicted to have the configuration 1s 2 2s 2 2p 6 3s 2 3p 6 3d 4 4s 2 written as Ar 3d 4 4s 2 but whose actual configuration given in the table below is Ar 3d 5 4s 1.
In order to write the Argon electron configuration we first need to know the number of electrons for the Ar atom there are 18 electrons.
Therefore its 17 electrons are distributed in the following manner.
Therefore the Phosphorus electron configuration will be 1s 2 2s 2 2p 6 3s 2 3p 3.
Chlorine has an atomic number of 17.
In writing the electron configuration for Argon the first two electrons will go in the 1s orbital.
Note that these electron configurations are given for neutral atoms in.
When we write the configuration well put all 18 electrons in orbitals around the nucleus of the Argon atom.
For example the electron configuration of the neon atom is 1s2 2s2 2p6 using the notation explained below.
M shell 7 electrons.
Phosphorus Electron Configuration Notation The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom.
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