Poenostavljen prikaz <a href="https://sl.wikipedia.org/wiki/elektronska_lupina" class="extiw" title="sl:elektronska lupina">elektronskih lupin</a> v atomu <a href="https://sl.wikipedia.org/wiki/helij" class="extiw" title="sl:helij">helija</a>.
<a href="//commons.wikimedia.org/wiki/User:Pumbaa80" title="User:Pumbaa80">Pumbaa</a>, translated by <a href="//commons.wikimedia.org/wiki/User:Dbc334" title="User:Dbc334">Dbc334</a>
CC BY-SA 2.0 uk
<a href="//commons.wikimedia.org/wiki/File:Electron_shell_002_Helium.svg" title="File:Electron shell 002 Helium.svg">Electron shell 002 Helium.svg</a>