<p>This configuration would be the expected configuration for the element after Oxygen if the third D nuclet would form a Li nuclet on one side of Carbon.</p>

<p>It seems that before a full new nuclet can be formed on either one of the two growing spots, the other side must be complete as well in the sense that first one side must be a neutral 5-ending before the other side can be occupied.&nbsp;</p>

<p>See Na where the first Li nuclet is attached to the initial Carbon nuclet.&nbsp;</p>