Which one of the following combinations will give the highest stability to a nucleus with atomic number Z and mass number N

Which one of the following combinations will give the highest stabilit

1.	Which one of the following combinations will give the highest stability to a nucleus with atomic number Z and mass number N
Answer» Even Z and odd N Odd Z and even N EvenZ and even N Odd Z and odd N Solution :n/p ratio is 1 in all the light stable nuclei upto CALCIUM and there after the ratio isgreater than 1 and increases up to 1.6. Nuclei that fall above the stability zone have an EXCESS of neutrons while those lying below have more PROTONS. Both of these CAUSE INSTABILITY. Even Z and even N give high stability to nucleus.