<p>Lithium 6 is a low in abundance isotope of Lithium 7.</p>
<p>It is stable and has one neutron less than Li7 namely 6 protons and has therefore 3 inner electrons. The inner electrons are thought of to take place here in the center of the 3 intertwined tetrahedrons and therefore 'occupying' both the upper and lower triangular faces. </p>
<p>See Lithium 7 for further description.</p>
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