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Which of the following are INCORRECT matches between electron configuration and the element's block and group?

1. [Rn] 6d² 7s² -> d-block, Group 4
2. [Xe] 4f¹⁴ 5d¹ 6s² -> d-block, Group 3
3. [Xe] 4f⁷ 6s² -> f-block, Group 9
4. [Kr] 4d¹⁰ -> d-block, Group 12

Correct answer: [Kr] 4d¹⁰ -> d-block, Group 12

Solution

[Kr] 4d¹⁰ is the configuration of Pd (Palladium), which belongs to Group 10 of the d-block. Group 12 (Zn, Cd, Hg) has configuration (n-1)d¹⁰ ns². Also, [Xe] 4f⁷ 6s² is Eu (f-block lanthanide), and assigning it Group 9 is incorrect because f-block elements are not assigned main group numbers. Both C and D are incorrect matches.

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