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Also, we know that the mass number of an isotope is a whole number.Now, since the atomic masses of an isotope of an element are generally a fractional number, the mass number of that isotope which should be a whole number is obtained by rounding off the value of the atomic masses of that isotope to the nearest whole number.Since an atom having no charge, means the number of electrons must be equal to the number of protons that is the atomic number.Hence, in an atom the atomic number is also equal to the number of electrons.On the basis of atomic number and mass number, elements can be classified as isotopes, isobars and isotones.
To date past events, processes, formations, and fossil organisms, geologists employ a variety of techniques.
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. $^_H$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., $^_H$ , $^_H$ & $^_H$.
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