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  • The unit in which atomic and nuclear masses are measured is called atomic mass unit (amu).

  • One amu is defined as 1/12th of the mass of an atom of isotope.

              i.e., 1 amu = 1.66×10-27 kg

  • Atomic masses can be measured using a mass spectrometer.

  • The different types of atoms of the same element which exhibit similar chemical properties, but have different masses are called isotopes.
  • Isotopes are the atoms of an elements whose nuclei have theā€¦

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