Helium is an unreactive gas and neon is a gas of extremely low reactivity. Give reasons.

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Solution

Both helium (He) and neon (Ne) have filled outermost shells. Helium has a duplet in its K shell, while neon has an octet in its L shell. Both Helium and Neon are inert gases.

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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.

(a) Lithium, sodium, potassium are all metals that react with water to liberate hydrogen gas. Is there any similarity in the atoms of these elements?

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