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Scandium Sc Atomic Number: 21 Atomic Weight: 44.955912 Melting Point: 1812 KBoiling Point: 3109 KSpecific mass: 2.989 g/cm3 Electronegativity: 1.36
Yttrium Y Atomic Number: 39 Atomic Weight: 88.90585 Melting Point: 1799 K Boiling Point: 3609 KSpecific mass: 4.469 g/cm3 Electronegativity: 1.22
Lutetium Lu Atomic Number: 71 Atomic Weight: 174.9668 Melting Point: 1936.15 K Boiling Point: 3675 KSpecific mass: 9.84 g/cm3 Electronegativity: 1.27
Lawrencium Lr Atomic Number: 103 Atomic Weight: [266] Melting Point: 1900 K Boiling Point: ? KSpecific mass: ? 16 g/cm3 Electronegativity: 1.3
