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

. 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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Answer: Helium and neaon both are noble gas which belong the zero group in the modern periodic table. The common thing between helium and neon is that both have outermost shell completely filled with electrons. Helium has two electrons in its K shell whereas neon has 8 electrons in its outermost shell

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