Its extremely unlikely that the elements you chose, beryllium and lithium would form a long chain compound like you suggest. Consider, if the big circle in question has 3 connections, and is connected to something else, then it really makes 4 connections. Only one element on Earth makes 4 connections, or bonds, and forms long chains and ring shaped molecules*, and that's carbon. Start here: http://en.wikipedia.org/wiki/Organic_chemistry
*Well, carbon makes the most stable, easiest to form, large molecules, that aren't very long monotonous crystalline compounds. Silicon, for example, also forms 4 bonds and makes long chains, but silicon is more likely to form a rock, than a complex molecule.