6. Match the words making up multi-component terms & translate them

1. atomic	a) substance
2. inner	b) cloud
3. metallic	c) state
4. crystalline	d) point
5. solid	e) bond
6. liquid	f) energy
7. melting	g) shell
8. electron	h) number
9. ductile	i) solid
10. intermolecular	j) material

7. Complete the text with prepositions if necessary. Translate it into Ukrainian analyzing lexical transformations.

Primary Metallic Crystalline Structures (BCC, FCC, HCP)

There are 14 different types __ crystal unit cell structures or lattices are found __ nature. However most metals and many other solids have unit cell structures described __ body center cubic (bcc), face centered cubic (fcc) or Hexagonal Close Packed (hcp).

Body-Centered Cubic (BCC) Structure The body-centered cubic unit cell has atoms __ each __ the eight corners __ a cube (like the cubic unit cell) plus one atom __ the center __ the cube (left image below). Each __ the corner atoms is the corner __ another cube so the corner atoms are shared among eight unit cells. It is said to have a coordination number __ 8. The bcc unit cell consists __ a net total __ two atoms; one __ the center and eight eighths __ corners atoms.

The bcc arrangement does not allow the atoms to pack together as closely as the fcc or hcp arrangements. The bcc structure is often the high temperature form __ metals that are close-packed __ lower temperatures. The volume __ atoms __ a cell __ the total volume __ a cell is called the packing factor. The bcc unit cell has a packing factor of 0.68.

Some __ the materials that have a bcc structure include lithium, sodium, potassium, chromium, barium, vanadium, alpha-iron and tungsten. Metals which have a bcc structure are usually harder and less malleable than close-packed metals such as gold. When the metal is deformed, the planes __ atoms must slip __ each other, and this is more difficult __ the bcc structure. It should be noted that there are other important mechanisms __ hardening materials, such as introducing impurities or defects which make slipping more difficult. These hardening mechanisms will be discussed latter.

Face Centered Cubic (FCC) Structure The face centered cubic structure has atoms located __ each __ the corners and the centers __ all the cubic faces (left image below). Each __ the corner atoms is the corner __ another cube so the corner atoms are shared among eight unit cells. Additionally, each __ its six face centered atoms is shared with an adjacent atom. Since 12 __ its atoms are shared, it is said to have a coordination number __ 12. The fcc unit cell consists __ a net total __ four atoms; eight eighths __ corners atoms and six halves __ the face atoms as shown __ the middle image __. The image __ highlights a unit cell __ a larger section __ the lattice.

__ the fcc structure (and the hcp structure) the atoms can pack closer together than they can __ the bcc structure. The atoms __ one layer nest themselves __ the empty space __ the atoms __ the adjacent layer. To picture packing arrangement, imagine a box filled __ a layer __ balls that are aligned __ columns and rows. When a few additional balls are tossed __ the box, they will not balance directly __ top __ the balls __ the first layer but instead will come to rest __ the pocket created __ four balls __ the bottom layer. As more balls are added they will pack together to fill __ all the pockets. The packing factor (the volume __ atoms __ a cell __ the total volume __ a cell) is 0.74 __ fcc crystals. Some __ the metals that have the fcc structure include aluminum, copper, gold, iridium, lead, nickel, platinum and silver.