Q:

Which of the following pairs of nuclides are isotopes?

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Which of the following pairs of nuclides are isotopes?


  1. 2760Co and 2860Ni
  2. 4399Tc and 4298Mo
  3. 1940K and 4019K
  4. 1940K and 1939K

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D: Isotopes are two forms of the same element that have different numbers of neutrons in the nucleus. This means same symbol, and same atomic number (subscript), but different mass number (superscript).

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