Which of the following elements DOES NOT obey the octet rule?
1. radon
2. argon
3. xenon
4. helium
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Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. As you can see in the periodic table in the figure below, noble gases include helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn).
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