Question 3 (c)
Name three elements with filled outermost shells.

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Solution

Neon having atomic number 10 has electronic configuration: 2, 8.
Argon having atomic number 18 has electronic configuration: 2, 8, 8.
Krypton having atomic number 36 has electronic configuration: 2, 8, 8, 8, 8.
Therefore, three elements with filled outermost shell are neon, argon, and krypton.

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