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Fluorine
F; -1
Chlorine
Cl; -1
Bromine
Br; -1
Iodine
I; -1
Astatine
At; -1
Oxygen
O; -2
Sulfur
S; -2
Selenium
Se; -2
Tellurium
Te; -2
Nitrogen
N; -3
Phosphorus
P; -3
Arsenic
As; -3