Periodic Table of elements 7 10111213 15 16 17 18 1 Symbo t007 Solid Metals 4002602 Hg Liquid 10 Lanthanoids Baryum Unknown Actinoids 13 Sign 4 Scandium 47 154 5 Rb: Sr Nb f M Pd Ag Sn Sb Molybdenum Cadman Antimony 6 CS B 57-71Hf 32 Fanum 84 Ra89-103Rf Uuo For elements with no stable isotopes the mass number of the isotope with the longest half-life is in parentheses DesignandInterfaceCopyright1997MichaeldAyah(michael@dayah.com).http://www.ptable.com/ 61 Ce Nd1 Pm a Sm 2 Eu翟Gd Tb 3 Dy Ho Er Tm Neodymium Ptable bkm21题Find Atomic Mass from Periodic Table 9