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Elements 21-40
| Term | Definition |
|---|---|
| Scandium | Sc |
| Titanium | Ti |
| Vanadium | V |
| Chromium | Cr |
| Manganese | Mn |
| Iron | Fe |
| Cobalt | Co |
| Nickel | Ni |
| Copper | Cu |
| Zinc | Zn |
| Gallium | Ga |
| Germanium | Ge |
| Arsenic | As |
| Selenium | Se |
| Bromine | Br |
| Krypton | Kr |
| Rubidium | Rb |
| Strontium | Sr |
| Yttrium | Y |
| Zirconium | Zr |