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Isotopes have different physical properties due to

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Same number of protons

Same number of electrons

Same number of neutrons

Different number of neutrons or different mass numbers

answer is D.

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Detailed Solution

Isotopes have same atomic numbers but different mass numbers. It means number of neutrons should differ for the isotope elements.

Ex: $_{17}^{35} C l,_{17}^{37} C l$

${For}_{17}^{35} C l, No. of protons p = 17; No. of netrons n = 18$

${For}_{17}^{37} C l, No. of protons p = 17; No. of netrons n = 20$

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