Term of the Day
A small portion of a crystal latticeAn orderly, repeating arrangement of points in 3-D space in which each p;oint has surroundings identical to every other point. A crystal's constituent atoms, molecules, and ions are arranged about each lattice point. that by repetition can generate the entire lattice; the unit cellA small portion of a crystal lattice that by repetition can generate the entire lattice; the unit cell contains the same ratio of atoms or ions that is contained in a macroscopic sample of a substance. contains the same ratio of atomsThe smallest particle of an element that can be involved in chemical combination with another element; an atom consists of protons and neutrons in a tiny, very dense nucleus, surrounded by electrons, which occupy most of its volume. or ions that is contained in a macroscopic sample of a substanceA material that is either an element or that has a fixed ratio of elements in its chemical formula..