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Cobalt Co Atomic Number: 27 Atomic Weight: 58.933195 Melting Point: 1768.15 K Boiling Point: 3200 K Specific mass: 8.86 g/cm3 Electronegativity: 1.88
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Rhodium Rh Atomic Number: 45 Atomic Weight: 102.90550 Melting Point: 2239.15 K Boiling Point: 3968 K Specific mass: 12.41 g/cm3 Electronegativity: 2.28
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Iridium Ir Atomic Number: 77 Atomic Weight: 192.217 Melting Point: 2716.15 K Boiling Point: 4701 K Specific mass: 22.56 g/cm3 Electronegativity: 2.2
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Meitnerium Mt Atomic Number: 109 Atomic Weight: [278] Melting Point: ? K Boiling Point: ? K Specific mass: ? 37.4 g/cm3 Electronegativity: ?
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