From Infogalactic: the planetary knowledge core
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Fluorine
F
Atomic Number: 9
Atomic Weight: 18.9984032
Melting Point: 53.63 K
Boiling Point: 85.03 K
Specific mass: 0.001696 g/cm3
Electronegativity: 3.98
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Chlorine
Cl
Atomic Number: 17
Atomic Weight: 35.453
Melting Point: 172.31 K
Boiling Point: 239.11 K
Specific mass: 0.003214 g/cm3
Electronegativity: 3.16
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Bromine
Br
Atomic Number: 35
Atomic Weight: 79.904
Melting Point: 266.05 K
Boiling Point: 332.0 K
Specific mass: 3.122 g/cm3
Electronegativity: 2.96
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Iodine
I
Atomic Number: 53
Atomic Weight: 126.90447
Melting Point: 386.65 K
Boiling Point: 475.4 K
Specific mass: 4.93 g/cm3
Electronegativity: 2.66
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Astatine
At
Atomic Number: 85
Atomic Weight: [210]
Melting Point: 575.15 K
Boiling Point: 610 K
Specific mass: 7 g/cm3
Electronegativity: 2.2
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Ununseptium
Uus
Atomic Number: 117
Atomic Weight: [294]
Melting Point: ? 573–773 K
Boiling Point: ? 823 K
Specific mass: ? g/cm3
Electronegativity: ?
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