Chang, R., & Goldsby, K. A. (2016). Chemistry (12th ed.). McGraw-Hill Education.
Zumdahl, S. S., & Zumdahl, S. A. (2020). Chemistry: An Atoms First Approach (3rd ed.). Cengage Learning.
Tro, N. J. (2020). Chemistry: A Molecular Approach (5th ed.). Pearson Education.

Khan Academy. (n.d.). Introduction to the atom. Retrieved from https://www.khanacademy.org/science/chemistry/atomic-structure-and-properties
ChemLibreTexts. (2023). Periodic trends. Retrieved from https://chem.libretexts.org/Bookshelves/General_Chemistry/
Royal Society of Chemistry. (n.d.). Periodic table trends. Retrieved from https://www.rsc.org/periodic-table