Answer
(a) 1.13
(b) 1.45
(c) 1.23
(d) 1.36
(e) 1.51
Work Step by Step
The number of neutrons (N) = A-Z where A is the mass number and Z is the atomic number.
The number of protons (P)= Z where Z is the atomic number. Therefore, the neutron-to-proton ratio $(\frac{N}{P})$ is given by the expression
$\frac{N}{P}=\frac{A-Z}{Z}$.
(a) $\frac{N}{P}=\frac{A-Z}{Z}=\frac{17-8}{8}=1.13$
(b) $\frac{N}{P}=\frac{93-38}{38}=1.45$
(c) $\frac{N}{P}=\frac{67-30}{30}=1.23$
(d) $\frac{N}{P}=\frac{118-50}{50}=1.36$
(e) $\frac{N}{P}=\frac{196-78}{78}=1.51$
