Question

Among the following nuclides, the highest tendency to decay by ${\beta }^{\oplus }$ emission is :

• A. $C{u}^{68}$
• B. $C{u}^{59}$
• C. $C{u}^{70}$
• D. $C{u}^{67}$

Answer 1

The correct option is D $C{u}^{67}$

Among the following nuclides, the highest tendency to decay by ${\beta }^{\oplus }$ emission is $C{u}^{67}$ as it has highest neutron to proton ratio.
Beta-emission takes place from the elements above the band of stability where neutron to proton ratio is high.
During Beta-emission, neutron is converted to proton.
${}_0{n}^1+{\to }_1{p}^1{+}_1{\beta }^0$