This puzzle has 30 elements for you to find.  There are a lot more than just 30 elements, but I picked ones that were pretty common.

To make it easier on you, I'll tell you which elements I used.  Here are their symbols:  Al, Ar, B, Br, Ca, C, Co, Cu, F, Au, He, H, Fe, K, Li, Mg, Mn, Ne, Ni, N, O, P, Pt, K, Si, Ag, Na, S, Sn, W.  Good luck, chemistryhead!