Crystal Octahedron
crystal structures Chemistry?
1.Lithium bromide crystallizes with a Na Cl type structure. How many lithium ions are in the unit cell
a.12
b.8
c.4
d.6
The tetrahedron has how many edges?
The octahedron has how many edges?
If a small cation occupies the tetrahedral hole formed by anions, the coordination number of the cation is what?
Suppose the unit cell of a crystalline ionic compound consists of a cube with ions of element X at each corner and ions of element Y at the CENTRE of each face. What is the empirical (simplest) formula of this compound?
a. X3Y4
b. XY4
c. X2Y3
d. XY3
e. X3Y
f. X4Y3
g. X4Y
Well for the first one, lithium bromide crystallizes with a nacl type structure.
Since Na is a cation and Lithium is a cation, their ion number must be the same.
Well for Na, there are 4 per unit cell. ( 12 edge atoms * 1/4) + (1 center atom = 1) so 3 + 1 = 4. If you want more info on this, contact me or it's on the internet LOL
anyways, so tehre would be 4 ions in teh unit cell, so it would be C ( answer).
the tetrahedron has 6 edges, the octahedron has 12.
If a small cation occupies the tetrahedral hole formed by anions, the coordination number of the cation would be 4. ( i am guessing .. but i'm prettysure), because for the octahedral hole, it would be 6. i'm thikning the answer is 4.
for the last question it would be xy3 because x is the corner atoms ( 8 * 1/8) and then y is the face atom (6*1/3)
so it would be xy3
Unit cell quasi octahedra of icosahedra
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