Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do the

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Periodic Classification of Elements

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

Option A

Option B

Option C

Option D

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.

Standard 10

Science

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