What is a three-dimensional structure that represents the alternating pattern of particles in a crystal?
a.)a polyatomic ion
b.)a crystal lattice
c.)an ionic bond
d.)a formula unit

A solid which is composed of atoms or ions which are  arranged in an orderly repetitive array is said to be a crystal . Arrangement of atoms or group of atoms in a three dimensional ordered pattern in a crystal is said to be a crystalline lattice. The arrangement of atoms are in specific pattern and are in high symmetry.

Hence, a crystal lattice is a three-dimensional structure that represents the alternating pattern of particles in a crystal.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: