1. Introduction

2. Generalized Seniority Scheme

3. The Generalized Seniority Schmidt Model and the $g-$ Factors

4. Generalized Seniority Isomers in $\mathbf{Hg}$, Pb and Po Isotopes

5. $B(E2)$ Trends for the First $2^{+}$ States in $\mathbf{Hg}$, Pb and Po Isotopes

6. Predictions and Future Outlook

7. Conclusion