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