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Q.

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

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a

Inert gas

b

Inner-transition element 

c

Normal element

d

Transition element

answer is B.

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Detailed Solution

The element ‘X’ is ‘Cu’. Its electronic configuration is (Ar) 4s1 3d10.  In third shell  and in fourth shell  is present.

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