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Q.
Atoms with same atomic number and different mass numbers are called
Jharkhand CECEJharkhand CECE 2009
Solution:
Isotopes have the same atomic number but different mass numbers eg, $ {{\,}_{1}}{{H}^{1}},{{\,}_{1}}{{H}^{2}},{{\,}_{1}}{{H}^{3}} $ are the isotopes of hydrogen.