Question
Mention the different atomic and physical properties of group 17 elements.
| Property | Element | ||||
| F | $Cl$ | $Br$ | I | At | |
| Atomic number | 9 | 17 | 35 | 53 | 85 |
| Atomic mass (g/mol) | $19.0$ | $35.45$ | $79.90$ | $126.90$ | 210 |
| Ionisation enthalpy $kJ / mol ^{-1}$ | 1680 | 1256 | 1142 | 1008 | - |
| Electronegativity | $4.0$ | $3.2$ | $3.0$ | $2.7$ | $2.2$ |
| Electron gain enthalpy $kJ mol ^{-1}$ | $-333$ | $-349$ | $-325$ | $-296$ | - |
| Isnic radius $E^{-}(p m)$ | 133 | 184 | 196 | 220 | - |
| Atomic radius (pm) | 64 | 99 | 114 | 133 | - |
| Melting point K | $54.4$ | $172.0$ | $265.8$ | $386.6$ | - |
| Boiling point K | $84.9$ | $239.0$ | $332.5$ | $458.2$ | - |
| Density $g ^{\prime} cm ^3$ | $1.5$ | $1.66$ | $3.19$ | $4.94$ | - |
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| Bond | $C - H$ | $O = O$ | $C = O$ | $O = H$ |
| $\Delta H^0 / kJ mol ^{-1}$ | 414 | 499 | 745 | 464 |