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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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