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Chemical Properties, Physical Properties and General Information

Radioactive Material Sign
Radioactive Natural Element
Radioactive Material Sign
Radioactive Synthetic Element
Toxic Material Sign
Toxic Element
Group 17 of the Periodic Table
Name Sym. No. Atomic
Phase Density Valence
Fluorine Toxic Element F 9 18.9984032 -219.62 C -188.12 C Gas 1.7 g/L 2s22p5 -1 (strongly acidic oxide)
Chlorine Toxic Element Cl 17 35.453 -101.5 C -34.04 C Gas 3.2 g/L 3s23p5 1, 3, 5, 7
(strongly acidic oxide)
Bromine Toxic Element Br 35 79.904 -7.3 C 58.8 C Liquid 3.1028 g/cm3 4s24p5 1, 5
(strongly acidic oxide)
Iodine Toxic Element I 53 126.904 113.7 C 184.3 C Solid 4.933 g/cm3 5s25p5 1, 5, 7
(strongly acidic oxide)
Astatine Radioactive Synthetic Element At 85 210 302 C 337 C Solid 7 g/cm3 6s26p5 1, 3, 5, 7
Ununseptium Radioactive Synthetic Element 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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Last updated: April 2011
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