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Question

Which of the following is a transition element as per the ground state electronic configuration ?

A
Hg
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B
Au
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C
Cd
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D
Zn
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Solution

The correct option is B Au
The ground state electronic configuration of the given elements is:

Hg80=[Xe]4f14,5d10,6s2
Au79=[Xe]4f14,5d10,6s1
Cd48=[Kr]4d10,5s2
Zn30=[Ar]3d10,4s2

The electronic configuration of only Au contains Incompletely filled orbital, i.e., partially filled orbital. That's why it is a transition element as per the ground state electronic configuration.

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