Question

A nucleus of atomic number $Z$ and mass number $A$ emits a $\beta$-particle.The atomic number and mass number of resulting nucleus is

• A. $Z,A$
• B. $Z+1,A$
• C. $Z,A+1$
• D. $Z-1,A-1$

Answer 1

The correct option is B $Z+1,A$

${}_Z^{A}X\to \beta {+}_{Z_1}^{A_1}Y$

Mass balance, $A=0+A_1$

$A=A_1$

Charge balance, $Z=-1+Z_1$

$Z_1=Z+1$