<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>Fluorine 19 is the only stable isotope. The reason Fluorine is 19 and not 18 can be seen in the structure here. One side of the Carbon backbone nuclet has for the first time a so called "neutral 5-ending". The ending is capped by two Deuterium nuclets and has a fifth extra neutron that support that side from collapsing or re-balancing to the other side of the Carbon. This particular ending can be seen as the extra needed structural integrity to keep the shape stable. </p>
<p>Chromium has 2 Boron (9) nuclets and 1 carbon nuclet. all 3 can be the +2 valence value (and probably +3 as well). Carbon can be -4 +4 also as we know. </p>
<p>Unsure where the carbon nuclet is positioned. </p>
<p>Carbon is the most 'perfect' element that is recognized in SAM. It is not only the most geometrical and complete element it is also the 'building block' for the larger elements. Multiple Carbon nuclets intertwined together are called the "backbone" of the Atom in the SAM model.</p>
<p>Carbon has 2 stable and 1 semi stable isotopes, C12, C13 and semi-stable C-14. <br />
</p>
<p>Boron has 2 stable isotopes, B10 and B11. B11 makes up about 80% of the total natural abundance. Boron is close to the complete shape of Carbon and is therefore already "Carbon like" in behavior. </p>
<p>Boron is in effect a geometric 'in between state' between Lithium and Carbon.</p>