Radioactive dating uranium

11-Aug-2015 05:49

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Also, we know that the mass number of an isotope is a whole number.

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For example, since two isotopes of chlorine have atomic masses equal to 34.980 and 36.977, the mass numbers are rounded off to 35 and 37 respectively. $^{1}_{1}H$Number of protons = 1 Number of electrons = 1 Number of neutrons = 0 The hydrogen element has atoms with mass number 1, 2 and 3 i.e., $^{1}_{1}H$ , $^{1}_{1}H$ & $^{1}_{1}H$.Atoms of elements having the same atomic number with different mass numbers are called isotopes.