Question

How do we know how many ions there are per lattice point in a unit cell?

Answer #1

**Lattice points are the positions (or coordinates) where
you can place an atom or ion.so the number of ions/atoms in
different unit cells as follows.**

**In FCC unit cells, lattice points are located at the
corners and faces of the cube: 8 corners (1/8) + 6 faces (1/2) =
4.**

**In BCC unit cells, lattice points are located at the
corners and center of the cube: 8 corners (1/8) + center (1) =
2.**

**In Primitive unit cells, lattice points are located at
the corners of the cube: 8 corners (1/8) = 1.**

AgBr crystallizes in the NaCl lattice. how many Ag+ and Br-ions
are present in the unit cell? justify your answer.

How do you tell how many ions are in the unit cell of BaO?

Consider a one-dimensional Bravais lattice with two ions per
primitive
cell, with N primitive cells in total. How many phonon types are
there in the lattice

NaCl crystallizes in a cubic unit cell with Cl- ions on each
corner and each face. How many Na+ and Cl- ions are in each unit
cell of NaCl?

Calculate the atomic packing factor (APF) for the following:
(a) simple cubic unit cell with 1 atom per lattice point
(b) BCC unit cell with 1 atom per
lattice point
(c) FCC unit cell with 1 atom per lattice point

We can estimate the physical density of any material based on
the unit cell, the known size of the atoms it encompasses, and
their atomic mass. Since density=mass/volume, for the mass in the
unit cell we simply need to determine the number of atoms per cell
* their mass from the periodic table / Avogadro’s number. For the
volume of the unit cell, we just need to determine the lattice
parameter of the unit cell (a) following the same rules...

. How many shortest lattice paths from (1, 1) to (8, 9) that do
not pass through the point (4, 3) ?

Cesium Chloride (CsCl) unit cell
1). What are the number of (fractional) atoms per unit cell.
Cations: Anions:
2). Coordination number of Cs:
3). Lattice Parameter of the CsCl unit cell: Diagonal: Edge:

How do we know how many genes control development in an organism
like Drosophila? And how did we discover that selector
genes specify which adult structures will be formed by body
segments? Additionally, how do we know that eye formation in all
animals is controlled by a binary switch gene?

Draw a tetragonal P lattice; place an extra lattice point in (½,
½, 0), i.e., make a C centering of the lattice. Now, show that a
tetragonal C lattice does not exist, i.e. that it is equivalent to
(another) P lattice
I understand how to draw it, I just don't know how to prove that
its equivalent to another P lattice

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