Name
(c) three elements with filled outermost shells.

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Solution

Neon $(N e)$ , argon $(A r)$ and krypton $(K r)$ have filled outermost shells.

Element Electronic configuration Valence electrons Group

$N e (10)$ $2, 8$ $8$ $8$

$A r (18)$ $2, 8, 8$ $8$ $8$

$K r (36)$ $2, 8, 18, 8$ $8$ $8$

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