Why is neon and argon placed in group 18 of the periodic table?

1.	Why is neon and argon placed in group 18 of the periodic table?
Answer» Group 18: Properties of NOBEL Gases. The NOBLE gases (Group 18) are located in the FAR right of the periodic table and were previously referred to as the "inert gases" due to the fact that their filled valence SHELLS (octets) make them extremely nonreactive.

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