The term "2p_x" refers to a specific type of atomic orbital in quantum mechanics. It is part of the p orbital family, which is characterized by its dumbbell shape and is found in the second energy level of an atom. The "2" indicates the principal quantum number, while "x" denotes the orientation of the orbital along the x-axis. In the context of electron configuration, the "2p_x" orbital can hold a maximum of two electrons with opposite spins. This orbital plays a crucial role in the bonding and chemical properties of elements, particularly in the formation of covalent bonds in molecules.