A plot of the number of neutrons (N) against the number of protons (P) of stable nuclei exhibits upward 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):
β− - decay (β emission)
orbital or K - electron capture
neutron emission
β+ - decay (positron emission)
A
β+ - decay (positron emission)
B
β− - decay (β emission)
C
neutron emission
D
orbital or K - electron capture
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Solution
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nP ratio should increase and for that number of neutron should increase and proton should decrease.
0e−1+1P1→1n0 (K-electron capture)
1P1→1n0++1β0 (β+ decay)
In both cases the number of neutron increase by 1 and proton decrease by 1.
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