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Titanium Ti Atomic Number: 22 Atomic Weight: 47.867 Melting Point: 1933.15 K Boiling Point: 3560 K Specific mass: 4.54 g/cm3 Electronegativity: 1.54
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Zirconium Zr Atomic Number: 40 Atomic Weight: 91.224 Melting Point: 2125.15 K Boiling Point: 4682 K Specific mass: 6.506 g/cm3 Electronegativity: 1.33
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Hafnium Hf Atomic Number: 72 Atomic Weight: 178.49 Melting Point: 2500.15 K Boiling Point: 4876 K Specific mass: 13.31 g/cm3 Electronegativity: 1.3
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Rutherfordium Rf Atomic Number: 104 Atomic Weight: [267] Melting Point: ? 2400 K Boiling Point: ? 5800 K Specific mass: ? 23 g/cm3 Electronegativity: ?
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