Irawan, Arfa Destira, and Heppy Okmarisa. 2026. “The Effect of the Project-Based Learning (PjBL) Model on Students’ Learning Motivation in the Topic of the Periodic Table of Elements”. Hydrogen: Jurnal Kependidikan Kimia 14 (3). https://doi.org/10.33394/hjkk.v14i3.20847.