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Element X belongs to 4^th period. It contains 18 and 1 electron in the penultimate and ultimate orbit. The element X should be:

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Inert gas

Inner-transition element

Normal element

Transition element

answer is B.

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Detailed Solution

The element ‘X’ is ‘Cu’. Its electronic configuration is $(A r) 4 s^{1} 3 d^{10}$ . In third shell and in fourth shell is present.

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