Question

Reasons why some elements do not obey aufbau's principle

Answer 1

Answer:

Explanation:

Elements such as Copper and Chromium do not obey auf bau principle because their d subshell is more stable than the partially filled d dubshell so an electron from 4s orbital gets excited and is passed on to 3d orbital and thus disobey's the auf bau priniciple.

Answer 2

Answer:

For higher atomic number elements, the differences in the energy levels becomes very small, and the change due to filling a subshell is more common than at lower atomic numbers. For example, ruthenium, rhodium, silver and platinum are all exceptions to the Aufbau principle because of filled