Question

part d
what is the atomic symbol of an isotope of bismuth with 125 neutrons?
express your answer as an isotope.

part f
what is the atomic symbol of an isotope with the same mass number as in part d, and 131 neutrons?
express your answer as an isotope.

Explanation:

Step1: Find mass number from Part D

Bismuth (Bi) has atomic number \(Z=83\). Neutrons=125, so \(A=83+125=208\).

Step2: Calculate atomic number for Part F

\(A=208\), neutrons=131. \(Z=208-131=77\). Element 77 is iridium (Ir).

Answer:

\(^{208}_{77}\text{Ir}\)