cubes

Question 1

three types of cubic lattices

Answer 1

-primitive (“simple’”) cubic lattices
-body centred cubic lattices
face-centered cubic lattices

Question 2

Coordinatino number

Answer 2

number of neighbour to each atom

Question 3

lattice points in primitive cubic lattive

Answer 3

one on each corner (8 total)

Question 4

lattice points on body-centred cubic lattice

Answer 4

one on each corner (8), and one in the middle

Question 5

lattice points on face-centred cubic lattice

Answer 5

one on each corner (8), and one on each face (6)

Question 6

How many corners, faces, edges does a cube have?

Answer 6

• 8 corners
  -6 faces
  -12 edges

Question 7

what are the fractions of an atom based on where they are?

Answer 7

middle - 1/1
face - 1/2
edge 1/4
corner - 1/8

Question 8

what is the coordination nuumber for each lattice

Answer 8

Primitive - 6
body centred - 8
face centred - 12

Question 9

how many atoms do each of the cubic lattices have?

Answer 9

primitive cubic - 1 atom
body centred - 2 atoms
face centred - 4 atoms

Question 10

interstial

Answer 10

voides between space between spheres, having rouglhly triangular shape

Question 11

types of stacking and corresponding cube

Answer 11

primtive hexoginal - ABABAB
Phase center cubic - ABCABC
Body centric cobic - N/A

Question 12

packing effiency

Answer 12

hexoginal close packed - 74%
face centred cubic - 74%
body centred cubic -68%

Question 13

Combination of two metals can give an _______

Answer 13

alloy

Question 14

purpose of an alloy

Answer 14

-strength, hardness, resistance to corrosion

Question 15

two types of alloys

Answer 15

-substituional alloy
-interstitial alloy

Question 16

subsitutonal alloy + example

Answer 16

subsituing a metal for something else, like zinc or copper (brass)

Question 17

interstitial alloy + example

Answer 17

adding a molecules in the interstital spaces, ex: adding carbon to make steeel stronger

Question 18

two structures in ionic solids

Answer 18

-octahedral
-tetrahedral

Question 19

octahedral

Answer 19

site is sandwhich between three spheres of top layer and three spheres of bottom layer

Question 20

tetrahedral

Answer 20

sites are sanwhiched between three spheres of bottom layer, and one sphere above it

Question 21

larger anions are found in _______

structure of ionic solids

Answer 21

close-packing arrangments

Question 22

smaller cations are found in ______

structure of ionic solids

Answer 22

interstices

Question 23

two common structure types of ionic solids

Answer 23

-NaCl-type (rocksalt)
-Li2O type (antiflourite)