Electron Configuration

Tags

Chem/Atom

Cegep/2

Word count

102 words

Reading time

1 minute

Distribution of electrons in an atom

Representations

Boxes

Electrons as arrows in boxes as orbitals

[!example] $P:[\uparrow \downarrow ][\uparrow \downarrow ][\uparrow \downarrow ][\uparrow \downarrow ][\uparrow \downarrow ][\uparrow \downarrow ][\uparrow ][\uparrow ][\uparrow ]$

Standard notation

Electrons in each subshell

[!example] $\mathrm{P}:1\mathrm{s}{\phantom{A}}^{2}2\mathrm{s}{\phantom{A}}^{2}2\mathrm{p}{\phantom{A}}^{6}3\mathrm{s}{\phantom{A}}^{2}3\mathrm{p}{\phantom{A}}^3$

Noble gas notation

Core electrons represented by preceding noble gas + valence electrons in standard notation

The noble gas before an element always has the electron configuration of its core electrons.

[!example] $\mathrm{P}:[\mathrm{Ne}]3\mathrm{s}{\phantom{A}}^{2}3\mathrm{p}{\phantom{A}}^3$

Contributors

Ajitani Hifumi

Changelog

Last edited about 2 hours ago

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