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Lithium
Li
Atomic Number: 3
Atomic Weight: 6.941
Melting Point: 453.85 K
Boiling Point: 1615 K
Specific mass: 0.534 g/cm3
Electronegativity: 0.98
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Sodium
Na
Atomic Number: 11
Atomic Weight: 22.98976928
Melting Point: 371.15 K
Boiling Point: 1156 K
Specific mass: 0.97 g/cm3
Electronegativity: 0.96
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Potassium
K
Atomic Number: 19
Atomic Weight: 39.0983
Melting Point: 336.5 K
Boiling Point: 1032 K
Specific mass: 0.86 g/cm3
Electronegativity: 0.82
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Rubidium
Rb
Atomic Number: 37
Atomic Weight: 85.4678
Melting Point: 312.79 K
Boiling Point: 961 K
Specific mass: 1.53 g/cm3
Electronegativity: 0.82
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Caesium
Cs
Atomic Number: 55
Atomic Weight: 132.9054519
Melting Point: 301.7 K
Boiling Point: 944 K
Specific mass: 1.93 g/cm3
Electronegativity: 0.79
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Francium
Fr
Atomic Number: 87
Atomic Weight: [223]
Melting Point: ?
Boiling Point: ?
Specific mass: ?
Electronegativity: ?
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