Group 4 elements
Group 4 of the periodic table contains these elements: Titanium, Zirconium, Hafnium, Rutherfordium.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 22 | Ti | Titanium | 47.8671 | 4.506 | 1941 | 3560 | 1.54 | 1791 |
| 40 | Zr | Zirconium | 91.2242 | 6.52 | 2128 | 4650 | 1.33 | 1789 |
| 72 | Hf | Hafnium | 178.492 | 13.31 | 2506 | 4876 | 1.3 | 1922 |
| 104 | Rf | Rutherfordium | 261 | 23.2 | 2400 | 5800 | - | 1969 |