Final answer:
The student needs to shade elements with an outer electron configuration of ms2nd2. An example is calcium (Ca) with 4s2 3d0 configuration. Other elements with the same configuration include scandium, titanium, and vanadium.
Step-by-step explanation:
The student is asked to shade all the elements for which the neutral atom has an outer electron configuration of ms2nd2. The outer electron configuration refers to the arrangement of electrons in the outermost energy level of an atom. In this case, the student needs to identify elements that have two electrons in the s orbital and two electrons in the d orbital of their outermost energy level.
An example of an element with the specified electron configuration is calcium (Ca), which has the electron configuration 4s23d0. The two electrons in the 4s orbital and the two electrons in the 3d orbital satisfy the condition ms2nd2.
Other elements that have the same electron configuration include scandium (Sc), titanium (Ti), and vanadium (V), among others.