H He
Li Be   B C N H 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 La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po As Rn
Fr Ra Ac  
  Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
  Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr