Term of the Day
A compoundA substance made up of two or more elements and having those elements present in definite proportions; a compound can be decomposed into two or more different substances. containing oppositely charged ions held together by electrostatic attractionThe attraction between opposite electric charges that holds ions together in a crystal lattice and causes electrons to be attracted to atomic nuclei. The attractive force can be calculated using Coulomb's law.. Usually the ions are in 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. with positive ions surrounded by negative ions and negative ions surrounded by positive ions.