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9 March, 21:06

What is the atomic number for lithium-6?

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  1. 9 March, 22:44
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    A lithium atom contains 3 protons in its nucleus irrespective of the number of neutrons or electrons. Notice that because the lithium atom always has 3 protons, the atomic number for lithium is always 3. The mass number, however, is 6 in the isotope with 3 neutrons, and 7 in the isotope with 4 neutrons.
  2. 9 March, 22:52
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    The atomic number of all isotopes of lithium is 3. The isotope doesn't matter because an isotope contains the same protons. All isotopes of a given element share the same atomic number
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