Final answer:
The major group of elements found along the zig-zag line of the periodic table are Metalloids, which possess properties of both metals and nonmetals.
Step-by-step explanation:
The major group of elements found along the zig-zag (or staircase) line of the periodic table are the Metalloids. Metalloids are elements that possess properties of both metals and nonmetals. They are located between the metals and nonmetals on the periodic table and include elements like silicon, germanium, and arsenic.
Learn more about Metalloids on the periodic table