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Isotopes are not designated by atomic number. The element with atomic number 88 is Radium. Because different isotopes of the same element vary by the number of neutrons in the nucleus, the isotope is designated by the Atomic Mass. For example, most carbon atoms have six protons, so the atomic number is 6. The most common isotope has 6 neutrons, so the isotope (Carbon 12) is the same as the atomic mass, 12 (6P + 6N), but there are isotopes with atomic masses of 13 (6P + 7N) and 14 (6P + 8N). Carbon 14 is familar as a dating tool when organic compounds are present. The only isotope given for Radium in the Periodic Table is 266.

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16y ago

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