silver electron configuration

[Ellen Tsai 3D]

Silver is Ag and I got the electron configuration to be [Kr] 4d9 5s2 but in the textbook it says [Kr] 4d10 5s1 can someone explain please?

[Sujin Lim 1H]

The electron configuration for silver falls under the exception that professor mentioned during lecture. He stated that Copper is an exception because instead of being [Ar] 3d9 4s2, it is [Ar] 3d10 4s1 because it is more stable/less energy for the d-orbital to be fully filled. The same rule applies for silver. Instead of [Kr] 4d9 5s2, it is [Kr] 4d10 5s1 because it is more stable for the d-orbital to be completely filled with 10 electrons, instead of having just 9. I would refer to Week 3 Friday Lecture to get further clarification!

[Ruiyu Li 3I]

Silver belongs to the group of exception. Professor Lavelle mentioned in the lecture that there are two exceptions, one of which is copper. The electron configuration for copper is [Ar]3d10 4s1 instead of [Ar]3d9 4s2. The same situation applies to the other elements in the group. The valence electron configuration for elements in group 11 is nd10 ns1. So the electron configuration of silver is [Ar]4d10 5s1.