9F
Fluorine
플루오린 · フッ素
Halogen
Atomic number9
ElementF — Fluorine
Atomic mass18.998
CategoryHalogen
Group17
Period2
Electron config[He] 2s2 2p5
Shells2,7
State (RT)Gas
Melting pt-220°C
Boiling pt-188°C
Electronegativity3.98
Discovered1886
Main usesToothpaste, Teflon, refrigerants
2 · 7