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Arrangement of atoms and ions in solid : (THEORY (FCC Screenshot 2019-09…
Arrangement of atoms and ions in solid :
THEORY
FCC
shared among 8 unit cell
coordination no = 12
net total of 4 atoms [8(1/8),6(1/2)]
exp: aluminium, copper, gold
BCC
shared among 8 unit cell
coordination no = 8
net total of 2 atoms [1-center, 8(1/8)]
exp: lithium, sodium, potassium
HCP
shared among 6 unit cell
coordination no = 12
net total of 6 atoms [12(1/6),2(1/2),3]
exp: magnesium, zinc, beryllium
METHODS
Arrange the spheres into FCC, BCC and HCP structure
the spheres are filled in a plastic strip layer by layer
the structures formed are observed
WHAT I LEARN
the different structure of FCC, BCC, HCP
determine tetrahedral hole and octahedral hole
