First-Row Transition Metals
- Found in period 4 (Sc to Zn)
- Use 3d electrons
- Smaller in size, less metallic
- Form colored compounds and show variable oxidation states
- Example: Iron, Copper, Titanium
Second-Row Transition Metals
- Found in period 5 (Y to Cd)
- Use 4d electrons
- Bigger in size, more metallic
- Form more stable compounds
- Example: Silver, Zirconium, Palladium
Third-Row Transition Metals
- Found in period 6 (Hf to Hg)
- Use 5d electrons
- Largest size, very metallic
- Form very stable compounds, often in higher oxidation states
- Example: Gold, Platinum, Tungsten
Simple Summary:
- First-row: smaller, less metallic, less stable compounds
- Second-row: bigger, more metallic, more stable compounds
- Third-row: largest, very metallic, very stable compounds