Answer
Electronic Configuration of Neon: 1s2, 2s2, 2p6
Electronic Configuration of Argon: 1s2, 2s2, 2p6, 3s2, 3p6
From the above electronic configurations, we observe that outer most shells (2 and 3 respectively) of both elements is completed. Hence according to octet rule, both element do not need any electron. Hence these elements are chemically inert.
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