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Fluorine
F2
Chlorine
Cl2
Bromine
Br2
Iodine
I2
Astatine
At2
Hydrogen (H)
Wants 2 electrons
Helium (He)
Wants 2 electrons
Beryllium (Be)
Wants 4 electrons
Boron (B)
Wants 6 electrons
Aluminum (Al)
Wants 6 electrons
Expanded octets
Period/Row 3 or below. P, S, Xe
Free radicals
Odd-electron molecules, think NO and NO2