Elements in the same group tend to have similar _____

• A. Color
• B. Mass
• C. Density
• D. Chemical Properties

Answer: (D)

Elements in the same group share the same number of valence electrons, and those outer electrons largely determine how an element bonds and reacts with other substances. Because they have the same valence electron configuration, they tend to behave similarly in chemical reactions, form similar kinds of compounds, and exhibit comparable reactivity patterns. That’s why their chemical properties line up within a group.

Color, mass, and density don’t govern how an element reacts with other elements. These physical attributes can vary widely even among elements in the same group, and they don’t predict the types of bonds or compounds an element tends to form.