Atomic Element Z = 9 • Halogen
Fluorine (F) — Atomic Data, Electron Shells & Reactions
Fluorine (symbol F, atomic number 9) has a standard atomic weight of 18.998 u and ground-state configuration [He] 2s2 2p5.
Atomic Number (Z)
9
IUPAC Symbol
F
Standard Atomic Weight
18.998 g/mol
Period / Group / Block
2 / 17 / p-block
Condensed Electron Config
[He] 2s2 2p5
Full Subshell Config
1s2 2s2 2p5
Principal Shell Occupancy
[2, 7]
Pauling Electronegativity
3.98
First Ionization Energy
1681 kJ/mol
Covalent Radius
57 pm
Melting Point
53.48 K (-219.67 °C)
Boiling Point
85.03 K (-188.12 °C)
Density
0.001696 g/cm³
Oxidation States
-1
F (Z=9) — Valence shell highlighted in vermilion