The fourth element on the periodic table is Beryllium, represented by the symbol Be.
Beryllium is a lightweight, gray-white metal that is primarily used in aerospace materials, nuclear reactors, and as a hardening agent in alloys. It has an atomic number of 4, which means it has four protons in its nucleus. Beryllium is known for its high melting point and excellent thermal conductivity, making it valuable in various applications. It’s important to handle beryllium with care, as its dust and fumes can be toxic if inhaled.