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2010-05-06 04:35:22
2010-05-06 04:35:22

Helium had valence electron of 2 and filled the most inner ring so it is chemically robust and inert.

Outer valence electron ring contain 8 electrons so for Neon is robust as it had 2,8 electrons and Argon had 2,8,8 electrons and fill the outer ring.

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because of the electron configuration are different



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