The elements that touch the zig-zag line in the periodic table are known as metalloids. Metalloids are elements that have properties of both metals and nonmetals. They are located in the p-block of the periodic table and include boron (B), silicon (Si), germanium (Ge), arsenic (As), antimony (Sb), tellurium (Te), and polonium (Po).

Metalloids share some characteristics with metals, such as their ability to conduct heat and electricity. However, they also share some characteristics with nonmetals, such as their ability to form covalent bonds. Metalloids typically have a shiny appearance, but they are not as malleable or ductile as metals.

Metalloids are used in a variety of applications, including semiconductors, solar cells, and electronic devices. They are also used as catalysts in chemical reactions.