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Scandium Sc Atomic Number: 21 Atomic Weight: 44.955912 Melting Point: 1812.15 K Boiling Point: 3109 K Specific mass: 2.989 g/cm3 Electronegativity: 1.36
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Yttrium Y Atomic Number: 39 Atomic Weight: 88.90585 Melting Point: 1799.15 K Boiling Point: 3609 K Specific mass: 4.469 g/cm3 Electronegativity: 1.22
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Lutetium Lu Atomic Number: 71 Atomic Weight: 174.9668 Melting Point: 1936.15 K Boiling Point: 3675 K Specific mass: 9.84 g/cm3 Electronegativity: 1.27
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Lawrencium Lr Atomic Number: 103 Atomic Weight: [262] Melting Point: 1900 K Boiling Point: ? K Specific mass: ? g/cm3 Electronegativity: 1.3
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