In a simple cubic lattice, there is 1 atom per unit cell (1/8 atom from each of the 8 corners).

In a face-centered cubic (FCC) structure, each atom is in contact with 12 other atoms, giving it a coordination number of 12.

In a face-centered cubic unit cell, there are 4 atoms (1/8 from each of the 8 corners and 1/2 from each of the 6 faces).

Metallic solids are primarily held together by metallic bonding, which involves a 'sea of electrons' that are free to move.

The body-centered cubic (BCC) structure features body-centered packing, where one atom is at the center of the cube and eight atoms are at the corners.

Ionic solids are characterized by high melting points due to the strong electrostatic forces between the ions.

Iodine (I2) is an example of a molecular solid, where molecules are held together by van der Waals forces.

Brittleness is not a property of metals; they are typically malleable and ductile.

The face-centered cubic (FCC) structure has the highest packing efficiency of approximately 74%.

Crystalline solids have a definite melting point due to their ordered structure, unlike amorphous solids which melt over a range of temperatures.