properties of solids

cubic cell has additional atoms on each of its 6 faces where each is shared with another neighboring cube.

face-centered cubic unit cell (FCC)

• Is formed when unit cells are repeated in all directions

crystal lattice

are those whose atoms, ions, or molecules are ordered in well-defined arrangements.

crystalline solids

7 basic types of unit cells

cubic, tetragonal, orthorhombic, monoclinic, rhombohedral, hexagonal, triclinic

These are shared with 7 other neighboring cubes that come together at the same point.

simple cubic

4 types of crystalline solids

ionic solids, metallic solids, covalent solids, molecular solids

example of crystalline solids

sugar, ice, salt, and gems

derived from the greek word "without form"

amorphous solid

is formed when the temperature of a liquid is low and the pressure is sufficiently high causing the particles come very close to each other

solids

Are solids whose particles do not have orderly structures; therefore, they have poorly-defined shapes.

amorphous solids

• The smallest portion of the crystal which shows the complete pattern of its particles.

unit cell

example of face-centered unit cell

Aluminum, Copper, Gold, and Silver

3 kinds of cubic unit cells

simple cubic, body-centered cubic unit cell, face-centered cubic unit cell

• They usually have flat surfaces or faces, and sharp angles.

crystalline solids

• are rigid because their molecules have fixed positions.

solids

• These solids have regular shapes.

crystalline solids

also known as non-crystalline solids

amorphous solid

Cubic unit cell has an additional atom in the center of its cube

body-centered cubic unit cell (BCC)

Unit cell has an atom at each an atom at each of the 8 corners of the cube.

simple cubic

example of body-centered cubic unit cell

iron, tungsten, and chromium

example of simple cubic

polonium