  The symmetry of the Periodic Table makes it possible to predict certain
properties of similar elements and compounds using one of them as a template.
Magnesium diboride, MgB2, presents a useful template in the search for similar
materials. Starting from electronegativity, valence electron and atomic number
equivalency, we identify many potential similar materials. One of them is the
beryllium silicide, Be2nSin cluster system. We establish that though not yet
produced in bulk, Be2Si exists. We show from symmetry principles that beryllium
silicide and some of its clusters will be MgB2-like superconductors with Tcs
close to or higher than 39K.
