Zirconium Zr 4091.2244Modified and reproduced, with permission from Lide DR (editor-in-chief): CRC Handbook of Chemistry and Physics,83rd ed. Atomic Atomic Atomic Atomic Name Symbol No.Weight Valence Name SymbolNo. In each case, the values in parentheses inthe atomic weight column are the mass numbers of the most stable isotopes. Sev- 12eral of those more recently discovered are represented only by the unstable isotopes. For the sake of completeness, all known elements are included in the list. 1.Standard Atomic WeightsBased on the assigned relative mass of C = 12.
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