<p>Helium 4 is a complete tetrahedron. It consists of 4 protons in a triangular shape with 2 inner electrons. The other 2 electrons are in the outer orbital (complete S-orbital). </p>
<p>He4 is stable and can be seen as 2 Deuterium nuclei merged together. This shape is the most fundamental repeating geometric grouping (nuclet) that the further atomic structure is based upon. See the "<a href="/book/theory/nuclets-building-blocks-nucleus" title="Nuclets - Building Blocks of the Nucleus">Nuclets - Building Blocks of the Nucleus</a>" page.</p>
<p>He4 is considered the first noble element. </p>
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