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JEE Advanced2016ChemistryChemical KineticsActual

A plot of the number of neutrons ( N ) against the number of protons ( P ) of the stable nuclei exhibits upwards deviation from linearity for atomic number, Z > 20 . For an unstable nucleus having N P ratio less than 1 , the possible mode(s) of decay is (are):

Options

  1. Aβ - decay ( β emission)
  2. BOrbital of K-electron capture
  3. CNeutron emission
  4. Dβ + decay (positron emission)

Correct answer

B. Orbital of K-electron capture

Step-by-step solution

As N P ratio is less than 1 , for possible decay mode, N P ratio should increase. The possible modes are α -decay, K-capture and β + -decay. Hence, the correct options are 2 and 4 (In β - -decay or neutron decay, N P ratio will decrease further). N P should increase. So, 0 e - 1 + p 1 1 ⟶ n 1 0 [K-electron Capture] p 1 1 ⟶ n 1 0 + β 0 1 [ β + -decay]

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