Isotopes of an element have
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Different number of neutrons
Reason — Isotopes of an element have same atomic number (i.e., number of protons) and different mass number (i.e., sum of protons + neutrons).
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Rutherford's alpha–particle scattering experiment was responsible for the discovery of
Number of valence electrons in Cl- ion are
Which one of the following is a correct electronic configuration of Sodium?