Helium is an unreactive gas and neon is a gas of extremely low reactivity. What (if anything) do their atoms have in common?

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Solution

Things common to neon and helium:
1) It belongs to the last group with all the gas whose last shell is common and they are unreactive unlike to other elements which react to complete their last shell with a total of 8 electrons.
2) Helium and Neon have in common that they have their shell complete and they reacts very less or they don't.

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Helium is an unreactive gas and neon is a gas of extremely low creativity.What,if anything, do their atoms have in common.

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