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Reference
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Halogens
Chemical Properties, Physical Properties and General Information
Radioactive Natural Element | Radioactive Synthetic Element | Toxic Element |
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Group 17 of the Periodic Table |
Name | Sym. | No. | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Valence Electrons | Oxidation States |
Fluorine | F | 9 | 18.9984032 | -219.62 °C | -188.12 °C | Gas | 1.7 g/L | 2s22p5 | -1 (strongly acidic oxide) |
Chlorine | Cl | 17 | 35.453 | -101.5 °C | -34.04 °C | Gas | 3.2 g/L | 3s23p5 | ±1, 3, 5, 7 (strongly acidic oxide) |
Bromine | Br | 35 | 79.904 | -7.3 °C | 58.8 °C | Liquid | 3.1028 g/cm3 | 4s24p5 | ±1, 5 (strongly acidic oxide) |
Iodine | I | 53 | 126.904 | 113.7 °C | 184.3 °C | Solid | 4.933 g/cm3 | 5s25p5 | ±1, 5, 7 (strongly acidic oxide) |
Astatine | At | 85 | 210 | 302 °C | 337 °C | Solid | 7 g/cm3 | 6s26p5 | ±1, 3, 5, 7 |
Ununseptium | Uus | 117 | 294 ? | Unknown | Unknown | Solid ? | Unknown | 7s27p5 | N/A |
Halogens: Group 17 of the periodic table, require one more electron to fill their outer electron shells, therefore are highly reactive, and as such can be harmful or lethal to biological organisms in sufficient quantities. Fluorine is the most reactive element in existence, even attacking glass, and forming compounds with the heavier noble gases. Halogen reactions produce salts known as halides.
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