85At
Astatine
아스타틴 · アスタチン
Halogen
Atomic number85
ElementAt — Astatine
Atomic mass210
CategoryHalogen
Group17
Period6
Electron config[Xe] 4f14 5d10 6s2 6p5
Shells2,8,18,32,18,7
State (RT)Solid
Melting pt302°C
Boiling pt337°C
Electronegativity2.2
Discovered1940
Main usesCancer research (radiotherapy)
2 · 8 · 18 · 32 · 18 · 7