
Group 17 elements
Group 17 of the periodic table contains these elements: Fluorine, Chlorine, Bromine, Iodine, Astatine, Tennessine.
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| No. | Symbol | Element | Atomic weight (u) | Density (g/cm³) | Melting point (K) | Boiling point (K) | Electronegativity | Discovered |
|---|---|---|---|---|---|---|---|---|
| 9 | F | Fluorine | 18.9984 | 1.696 | 53.48 | 85.03 | 3.98 | 1810 |
| 17 | Cl | Chlorine | 35.446 | 3.2 | 171.6 | 239.11 | 3.16 | 1774 |
| 35 | Br | Bromine | 79.901 | 3.1028 | 265.8 | 332 | 2.96 | 1825 |
| 53 | I | Iodine | 126.904 | 4.933 | 386.85 | 457.4 | 2.66 | 1811 |
| 85 | At | Astatine | 210 | 6.35 | 575 | 610 | 2.2 | 1940 |
| 117 | Ts | Tennessine | 294 | 7.17 | 723 | 883 | - | 2009 |