Isotopes are variants of a particular chemical element which differ in neutron number (neutral particle)and all isotopes of a given element have the same number of protons (positive particle) in each atom.So isotope B of the sodium will have 11 protons, 11 electrons but it may have a wide range in its number of neutrons.
Both Isotope has same number of protons and electrons but different number of neutrons.
Isotope A and B has 11 protons and 11 electrons but difference in neutrons. Isotopes is defined as two or more types of atoms that have the same atomic number in the periodic table, and that different number of neutrons in their nuclei. so we can conclude that both have same number of protons and electrons but different number of neutrons.
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