Beryllium, atomic number (Z) 4, is the second metallic element in the periodic table. By looking at the periodic table, one would think that it would be very similar to magnesium and calcium, but one would be wrong on several accounts. There shall be more about that later.
Beryllium is a comparatively rare element, both on earth and in the cosmos. There are a couple of reasons for that as well, and again there will be more about that later.
Most people have never seen the pure metal, but most of us have seen compounds of it, at least in jewelry stores, because it is an essential component of real emeralds. Let us take a look at this little know element and see what good it is, and any ill that it might cause.