Complete the following sentence with most appropriate term.Atoms in metals are arranged in a regular____.

The most appropriate term to complete the sentence is "lattice."

Atoms in metals are arranged in a regular lattice structure, which refers to a highly ordered arrangement of atoms in a repeating three-dimensional pattern. This regular arrangement contributes to the metallic properties such as conductivity and malleability. In a metallic lattice, atoms are held together by metallic bonds, where electrons are shared in a 'sea' of delocalized electrons, allowing for the flexibility and electron mobility that characterizes metals. This structure plays a crucial role in the behavior of metals in terms of their physical properties and their use in various applications, including construction, electronics, and transportation.