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The atomic number (top left) is the number of protons in the nucleus. The atomic mass (bottom) is weighted by mean isotopic abundances in the earth's surface. Atomic masses are relative to the mass of the carbon-12 isotope, defined to be exactly 12 atomic mass units (amu). If sufficiently stable isotopes do not exist for an element, the mass of its longest-lived isotope is indicated in parentheses. For elements 110–112, the mass numbers of the known isotopes are given. Reference: Schroeder (2000) as extracted from The European Physical JournalC3, 73 (1998).
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