Q2. Fill in the missing isotopic data of Antimony (Sb) in the following table:

Background

Topic: Isotopes and Atomic Mass

This question tests your understanding of isotopes, their masses, and natural abundances. You are asked to complete a table with missing information about the isotopes of antimony (Sb).

Key Terms and Formulas

• Isotope: Atoms of the same element with different numbers of neutrons (and thus different mass numbers).

• Isotopic Mass (amu): The mass of a specific isotope, measured in atomic mass units (amu).

• Abundance (%): The percentage of a particular isotope found in nature.

Step-by-Step Guidance

1. Examine the table: You are given the mass and symbol for one isotope ($^{121}\mathrm{Sb}$, 120.9038 amu) and the abundance for another isotope (42.79%).

2. Recall that naturally occurring antimony has two main isotopes: $^{121}\mathrm{Sb}$ and $^{123}\mathrm{Sb}$.

3. Use the information provided to match the missing data: The isotope with 42.79% abundance must be the other main isotope of Sb.

4. To fill in the missing mass, recall that the isotopic mass for $^{123}\mathrm{Sb}$ is typically around 122.904 amu (you may need to check a periodic table or data source for the exact value).

5. To fill in the missing abundance for $^{121}\mathrm{Sb}$, remember that the total abundance for all isotopes must add up to 100%. Set up the equation: $\text{Abundance of } ^{121}\mathrm{Sb} = 100\% - 42.79\%$.

Try solving on your own before revealing the answer!