Answer:
Of the following Period 4 elements, the one with the most metallic characteristics is:
As (3)
Arsenic (As) is a metalloid element that exhibits both metallic and nonmetallic properties. It has a high melting point, density, and electrical conductivity, which are all characteristics of metals. Additionally, arsenic has a high ionization energy and electronegativity, which are also indicative of a metallic element.
In contrast, calcium (Ca) and bromine (Br) are both nonmetallic elements that do not exhibit metallic properties. Calcium is a metalloid element that is more closely related to the alkaline earth metals, while bromine is a nonmetallic element that is a member of the halogen group.
Ge (germanium) is also a metalloid element, but it does not have as strong of metallic properties as arsenic.
Step-by-step explanation: