Nitrogen makes up 78% of Earth's atmosphere by volume. There ya go! Combine that with the necklace and you've got yourself the best (mildly awkward) conversation starter ever! Try it out at a party or maybe in class. Yeah, science class might be more appropriate. >>>>>ELEMENT CHOICE: If you do not leave a preference, we will send you the element photographed in the listing. Periodic Table tiles are available in the following elements: Ac, Ag, Al, Am, Ar, As, At, Au, B, Ba, Be, Bi, Bk, Br, C, Ca, Cd, Ce, Cf, Cl, Cm, Co, Cr, Cs, Cu, Db, Ds Dy, Er, Es, Eu, F, Fe, Fm, Fr, Ga, Gd, Ge, H, He, Hf, Hg, Ho, I, In, Ir, K, Kr, La, Li, Lr, Lu, Md, Mg, Mn, Mo, Mt, N, Na, Nb, Nd, Ne, Ni, No, Np, O, Os, P, Pa, Pb, Pd, Pm, Po, Pr, Pt, Pu, Ra, Rb, Re, Rh, Rn, Ru, S, Sb, Sc, Se, Si, Sm, Sn, Sr, Ta, Tb, Tc, Te, Th, Ti, Tl, Tm, U, Unh, Uno, Unp, Unq, Uns, V, W, Xe, Y, Yb, Zn, Zr
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