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He -259 -270 '253 -269 gas 2 gas Li Be B C IM O F Ne 3 Na Mg IHB IVB VB VIB VIIB VIIIB IB IIB Al Si P S Cl Ar 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Gs □e As Se Br Kr 5 fib Sj Y Zr Nb Mo Tc Hu Rh Pd AO Cd In Sn Sb Te 1 Xe 6 Gs Ba La HI Ta w Re Os Ir Pt Au Hg TI Pb Bi Po At Rn 7 Fr Rd AC Large Radii 3 Ci