From English Wikipedia @ Freddythechick
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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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