Question

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$<b> Which element has\ \textless \ br /\ \textgreater \ (a) two shells, both of which are completely filled with electrons?$

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Answer 1

NEON is an element whose two shells are completely filled with electrons.

Answer 2

$\sf{\underline {Neon \:has \:two \:shells.}}$

Electronic configuration = 1s^2 2s^2 2p^6

2 electrons in k shell, and 8 electrons in l shell.

Neon is an inert gas due to stable valence shell electronic configuration.