Fluorine ( F )

• Atomic number: 9
• Appearance: very pale yellow gas
• Standard atomic weight: 18.9984
• Group: group 17 (halogens)
• Period: 2
• Electron configuration: 1s² 2s² 2p⁵
• Element category: reactive nonmetal
• Melting point: 53.48 K
• Boiling point: 85.03 K
• Sublimation point:
Standard Temperature ( 273.15 ) and Pressure ( 1 bar = 10⁵ Pa )
• Phase at STP: ( F₂ ) gas
• Density at STP:
• Heat of fusion:
• Heat of vaporization: ( F₂ ) 6.51 kJ/mol
• Molar heat capacity: ( F₂ ) 23 kJ/(mol·K)
• Oxidation states: −1
• Electronegativity: Pauling scale: 3.98
• Covalent radius: 64 pm (1×10⁻¹² m)
• Van der Waals radius: 135 pm (1×10⁻¹² m)
• Crystal structure: cubic
• Speed of sound:
• Thermal expansion:
• Thermal conductivity: 0.02591 W/(m·K)