The valence shell of the element X contains 2 electrons in a 5s subshell. Below that shell, element X has a partially filled 4d subshell. What type of element is X?
A) alkali metal
B) chalcogen
C) transition metal
D) halogen
E) main group element

Question

Quizplus · Accepted Answer

The fact that element X has a partially filled 4d subshell indicates that it is a transition metal. The presence of 2 electrons in the valence 5s subshell suggests that it is a group 2 element, such as strontium or barium.

The Valence Shell of the Element X Contains 2 Electrons