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9F18.998
Fluorine
Diatomic NonmetalFluorine is a chemical element with symbol F and atomic number 9. It is the lightest halogen and exists as a highly toxic pale yellow diatomic gas at standard conditions. As the most electronegative element, it is extremely reactive:almost all other elements, including some noble gases, form compounds with fluorine.
Phase: Gas
2, 7
Physical Properties
Atomic Mass18.9984031636 u
Density1.696 g/cm³
Melting Point53.48 K
Boiling Point85.03 K
Period2
PhaseGas
Chemical Properties
Electron Configuration1s2 2s2 2p5
Semantic Config[He] 2s2 2p5
Shells2, 7
Electron Affinity328.1649 kJ/mol
Electronegativity3.98
Ionization Energies
IE1: 1681 kJ/molIE2: 3374.2 kJ/molIE3: 6050.4 kJ/molIE4: 8407.7 kJ/molIE5: 11022.7 kJ/molIE6: 15164.1 kJ/molIE7: 17868 kJ/molIE8: 92038.1 kJ/molIE9: 106434.3 kJ/mol
Discovery