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Question

The isotones of 13856Ba are:
  1. 13957La and 8838Sr
  2. 9242Mo and 14058Ce
  3. 14058Ce and 9242Mo
  4. 13957La and 14058Ce


Solution

The correct option is D 13957La and 14058Ce
Isotones are species that have the same number of neutrons but different atomic numbers.
Number of neutrons = mass number – atomic number
Number of neutrons in 13856Ba = 138 – 56 = 82
Number of neutrons in 13957La = 139 – 57 = 82 
Number of neutrons in 14058Ce = 140 – 58 = 82

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