F
Fluorine
Atomic number: 9Mass: 18.998 uCategory: Halogen
About Fluorine
Fluorine is the most electronegative and one of the most reactive elements. It is a pale yellow, poisonous, corrosive gas at room temperature. Fluorine forms compounds with almost every element, including noble gases.
Properties
Period
2
Group
17
Block
P
Category
Halogen
Electronegativity
3.98 (Pauling)
Ionization Energy
1681 kJ/mol
Melting Point
53 K (-220°C)
Boiling Point
85 K (-188°C)
Density
1.696 g/L
Oxidation States
-1
Electron Configuration
1s² 2s² 2p⁵
[He] 2s² 2p⁵
Shell 1:2e⁻
Shell 2:7e⁻
Real-World Uses
Toothpaste (fluoride)
Non-stick coatings (PTFE)
Refrigerants
Uranium processing
Pharmaceuticals
Fun Fact
Fluorine is so reactive that it can set fire to glass, concrete, and even water under the right conditions!