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Question

Which of these elements have a fully filled outermost shell?

A
Hydrogen
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B
Sodium
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C
Neon
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D
Carbon
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Solution

The correct option is C Neon
Each shell can accomodate 2n2 electrons. Thus, a fully filled first shell has 2 electrons, second shell has 8 electrons and so on.

Electronic configuration of the elements is given below-
AtomAtomic no.Electronic configurationHydrogen 11Sodium112,8,1Neon102,8Carbon62,4
Only neon has fully filled outermost shell.

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