Consider the following electronic configurations of neutral atoms: A. [ Ne ] 3s^2 3p^4 B. [ Ar ] 3d^6 4s^2 C. [ Kr ] 4d¹⁰ 5s^2 D. [ Xe ] 4f¹⁴ 5d¹⁰ 6s^2 6p^2 E. [ Ar ] 3d^5 4s^1 Which of the above configurations represent d-block elements?

Step-by-step solution

The block of an element is determined by the subshell in which the last electron enters. A. [ Ne ] 3s^2 3p^4 : The last electron enters the 3p subshell, so it is a p-block element (Group 16). B. [ Ar ] 3d^6 4s^2 : The last electron enters the 3d subshell, so it is a d-block element (Group 8). C. [ Kr ] 4d¹⁰ 5s^2 : The last electron enters the 4d subshell, so it is a d-block element (Group 12). D. [ Xe ] 4f¹⁴ 5d¹⁰ 6s^2 6p^2 : The last electron enters the 6p subshell, so it is a p-block element (Group 14). E. [ Ar ]