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Vanadium V Atomic Number: 23 Atomic Weight: 50.9415 Melting Point: 2175.15 K Boiling Point: 3680 K Specific mass: 6.11 g/cm3 Electronegativity: 1.63
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Niobium Nb Atomic Number: 41 Atomic Weight: 92.90638 Melting Point: 2741.15 K Boiling Point: 5017 K Specific mass: 8.57 g/cm3 Electronegativity: 1.6
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Tantalum Ta Atomic Number: 73 Atomic Weight: 180.94788 Melting Point: 3269.15 K Boiling Point: 5731 K Specific mass: 16.654 g/cm3 Electronegativity: 1.5
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Dubnium Db Atomic Number: 105 Atomic Weight: [268] Melting Point: ? K Boiling Point: ? K Specific mass: ? 29 g/cm3 Electronegativity: ?
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