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13 terms

Families 7A and 8A on Periodic Table

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F
Fluorine
Cl
Chlorine
Br
Bromine
I
Iodine
At
Astatine
117
Ununseptium
He
Helium
Ne
Neon
Ar
Argon
Kr
Krypton
Xe
Xenon
Rn
Radon
118
Ununoctium