1 H He
2 Li Be B C N O F Ne
3 Na Mg Al Si P S Cl Ar
4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
5 Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
6 Cs Ba Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
7 Fr Ra Rf Ha Sg Ns Hs Mt Uun
(6) La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
(7) Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr
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