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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3as055

Consider the species . Select all correct statements.

  1. AIt contains 74 neutrons
  2. BIt is isoelectronic with
  3. CIt is an isotone of
  4. DIt is an isotope of

Answer: A, B, C

Neutrons = 127 - 53 = 74; electrons = 53 + 1 = 54, the same as Xe (Z = 54), so it is isoelectronic with Xe. Xe-128 has 128 - 54 = 74 neutrons, equal to 74, so they are isotones. Xe-127 has a different atomic number but the same mass number, so it is an isobar, not an isotope.
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