Final answer:
The element with the valence electron configuration 4s2 4p5 is Bromine (D), which is located in the fourth period and Group 17 (7A) of the periodic table, indicating it has seven valence electrons.
Step-by-step explanation:
The element with the valence electron configuration of 4s2 4p5 is a halogen. Halogens are located in Group 17 (7A) of the periodic table and are known for having seven valence electrons, just one electron short of a full octet. The configuration 4s2 4p5 suggests that the element is in the fourth period and has five electrons in its p orbital, totaling seven valence electrons in the fourth energy level. Out of the choices given, Bromine (D) has this electron configuration. None of the other elements or ions listed - Fluorine (F), Sulfur (S), Calcium (Ca), Antimony (Sb) - have this specific electron configuration.