Physical Properties Of Halogen Family

PROPERTY ELEMENT
F Cl Br I At
Atomic number 9 17 35 53 85
Atomic mass 19.00 35.45 79.90 126.9 210
Covalent radius/pm 72 99 114 133
Ionic radius/pm 133 184 196 220
First ionization energy kjmol 1680 1256 1142 1008
electronegativity 4 3.2 3.0 2.7 2.2
Density (g/cm) 1.51 (85K) 1.66 (203K) 3.19 (273K) 3.96 (273K) 1.90
Melting point(K) 54.4 172 265.8 386.6
B-oiling point (K) 84.9 239 332.5 458.2
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