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Scandium Sc Atomic Number: 21 Atomic Weight: 44.955912 Melting Point: 1812 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 K Boiling Point: 3609 K Specific mass: 4.469 g/cm3 Electronegativity: 1.22
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Lanthanum La Atomic Number: 57 Atomic Weight: 138.90547 Melting Point: 1193 K Boiling Point: 3737 K Specific mass: 6.145 g/cm3 Electronegativity: 1.1
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Actinium Ac Atomic Number: 89 Atomic Weight: [227] Melting Point: 1323 K Boiling Point: 3471 K Specific mass: 10.07 g/cm3 Electronegativity: 1.1
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