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H                                                  He
Li Be                               B  C  N  O  F  Ne
Na Mg                               Al Si P  S  Cl Ar
K  Ca Sc Ti V  Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y  Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I  Xe
Cs Ba    Hf Ta W  Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra
         La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
         Ac Th Pa U  Np Pu Am Cm Bk Cf Es