Team Mendeleev Season 1 Episode 3 Hide & Seek

In this kids cartoon, you'll meet a new hero friend - Hydo (hydrogen), who also happens to be the lightest chemical element. His superpower is to be able to float, and Hydo uses it to win at hide-and-seek games. His chemical element friends Woolfy (wolfram), Coopy (copper), Ferro (ferrum), and Sil (silver), decide to find a way to make Hydrogen heavier so that he stays on the ground.