Question

Which electron configuration represents a transition element?

(A) 1s²2s²2p³
(B) [Ne]3s²
(C) [Ar]3d¹04s²4p
(D) [Ar]3d¹04s²4p

Answer 1

The electron configuration [Ar]3d¹⁰4s² represents a transition element. Transition elements are identified by having partially filled d subshells, which are indicated in the given electron configuration.

Step-by-step explanation:

The electron configuration that represents a transition element is (D) [Ar]3d¹⁰4s². Transition elements are characterized by having a partially filled d subshell, which can be in the same energy level as their outermost s electrons or one energy level lower. In this case, option D shows an electron configuration with a partially filled d subshell (3d¹), following the [Ar] core, making it a transition element.

To answer the review questions provided:

• The element represented by [Ne] 3s² 3p² is Silicon (Si).
• The element with the electron configuration [Ar]3d¹⁰4s² is Scandium (Sc).
• The noble gas that would be part of the electron configuration notation for Manganese (Mn) is [Ar].
• The electron configuration for Barium (Ba) is [Xe] 6s².