The periodic table of the elements coded in a four color key and titled "Can I lick it?" Green element - Sure, it's probably fine Yellow element - Maybe not a good idea Red element - You really shouldn't Purple element - Please reconsider Green: H, He, B, C, N, O, Ne, Mg, Al, Si, S, Ar, Ca, Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge, Kr, Y, Zr, Nb, Mo, Ru, Rh, Pd, Ag, In, Sn, Xe, La, Hf, Ta, W, Re, Ir, Pt, Au, Bi, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu Yellow: Li, P, Se, Sb, Te, Os, Pb, Th, U Red: Be, F, Na, Cl, K, As, Br, Rb, Sr, Tc, Cd, I, Cs, Ba, Hg, Tl, Pm Purple: Po, At, Rn, Fr, Ra, Ac, Rf, Db, Sg, Bh, Hs, Mt, Ds, Rg, Cn, Nh, Fl, Mc, Lv, Ts, Og, Pa, Np, Pu, Am, Cm, Bk, Cf, Es, Fm, Md, No, Lr
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