Chemistry PYQ 12 of 152 · Structure of Atom

The number of neutrons in the nucleus of plutonium nuclide (94Pu242) is

  1. A94
  2. B148
  3. C242
  4. D336
  5. ENone of the above / More than one of the above

66th BPSC

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Correct answer: (b) 148

Explanation

The mass number (242) is the sum of protons and neutrons in the nucleus.

The subscript gives the atomic number (94), which equals the number of protons in plutonium (Pu).

Number of neutrons = 242 − 94 = 148.

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