Fluorine F F₂
  highly toxic pale yellow diatomic gas
  atomic numb 9
  atomic mass 18.998
  electron shell 2,7
  melt point −219.67°C
  boil point −188.11°C
  Stable isotopes only 19

Chlorine Cl Cl₂
  yellow-green extremely reactive gas
  atomic numb 17
  atomic mass 35.45
  electron shell 2,8,7
  melt point –101.5°C
  boil point −34.04°C
  Heat of fusion Cl₂: 6.406 kJ/mol
  Heat of vaporization Cl₂: 20.41 kJ/mol
  heat capacity Cl₂: 33.949 J/(mol·K)
  Stable isotopes 35,37

Bromine Br Br₂
  fuming red-brown liquid
  atomic numb 35
  atomic mass 79.904
  electron shell 2,8,18,7
  melt point −7.2°C
  boil point 58.8°C
  density liquid 3.1028 g/cm³
  Heat of fusion: 10.571 kJ/mol
  Heat of vaporization: 29.96 kJ/mol
  heat capacity: 75.69 J/(mol·K)
  Stable isotopes 79,81

Iodine I I₂
  purple-black metallic solid
  atomic numb 53
  atomic mass 126.9
  electron shell 2,8,18,18,2
  melt point 113.7°C
  boil point 184.3°C
  density 4.933 g/cm³
  Heat of fusion (I₂): 15.52 kJ/mol
  Heat of vapor (I₂): 41.57 kJ/mol
  heat capacity (I₂): 54.44  J/(mol·K)
  Stable isotopes 127

Astatine At 85 210 2,8,18,32,18,7

Tennessine Ts 117 294 2,8,18,32,32,18,7