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Question

Which of the following configuration represents a noble gas?

A
1s22s22p63s23p63d104s24p64d105s2
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B
1s22s22p63s23p63d104s24f145s2
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C
1s22s22p63s23p63d104s24p64d105s25p6
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D
1s22s22p63s23p63d104s24p64d105s25p3
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Solution

The correct option is C 1s22s22p63s23p63d104s24p64d105s25p6
Noble gases have completely filled orbitals and belongs to group 18 which has outermost electronic configuration of ns2np6 where n is highest shell/period.
thus 1s22s22p63s23p63d104s24p64d105s25p6 is the noble gas configuration.

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