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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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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.
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what is the relation between population and economic?​
In isosceles triangle the length of a leg is 17 cm, and the base is 16 cm. Find the length of the altitude to the base.