Interpretation:
The reason for
Concept introduction:
Positron emission is a process in which a proton inside a radioactive nucleus is converted into a neutron while releasing a positron and an electron neutrino.

Answer to Problem 5STP
Correct answer:
Option B. It lies below the line of stability
Explanation of Solution
Reason for correct option:
Positron emission is a process in which inside a radioactive nucleus, a proton is converted into a neutron while releasing a positron and an electron neutrino. So, the element which is less stable undergoes to positron emission.
According to graph,
Reasons for incorrect options:
A. No, it lies below the stability line.
C. No, it has low neutron to proton ratio.
D. No, it does not have abundance of neutrons.
Chapter 24 Solutions
Chemistry: Matter and Change
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