# Chemistry

posted by .

Gold crystallizes in a face centered cubic structure. Using only a periodic table for refrence, determine the edge length of a gold unit cell. Show all Work.

• Chemistry -

so you have an atom at each corner. Draw a line through corner to corner along the diagnol. One atom in the center of the face. So the length of the line is 4radii. So the edge of the cell must be .707*4 radii. You can get the radii from the periodic table.

Your teacher might want you to find it from density of gold.
Each corner has 1/8 of an atom, each face 1/2 of an atom. That is 1+3 atoms per cell. You know the mass of each atom (atom mass/avag number), multipy it by 4, that is the mass of each cell.

density= mass/volume= mass/edge^3 solve for edge.

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### CHEM

Info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at the corners …
2. ### CHEM****

Initial info: The atoms of crystalline solid pack together into a three-dimensional array of many small repeating units called unit cells. The simplest of the unit cells are those that have cubic symmetry, with atoms positioned at …
3. ### chemistry

Gallium crystallizes in a primitive cubic unit cell. The length of an edge of this cube is 362 pm. What is the radius of a gallium atom?
4. ### Chem

Based on the number of atoms per unit cell and the mass of the atom, the mass of the unit cell can be calculated. The density of the unit cell and the material as a whole can be determined from the mass and the volume of the unit cell …
5. ### chemistry

the metal gold, with an atomic radius of 144.2pm crystallizes in a face-centered cubic lattice. what is the density of gold?
6. ### Chemistry

1. The eleent gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell?
7. ### Science: Chemistry

1. The element gold, Au, has a face-centered cubic structure. (Density - 19.3 g/cm^3) (a) What are the # of gold atoms in 1 unit cell?
8. ### general chemistry

Copper crystallizes in a face-centered cubic unit cell with an edge length of 362 pm. What is the radius of a Cu atom in pm?
9. ### general chemistry

Copper crystallizes in a face-centered cubic unit cell with an edge length of 362 pm. What is the radius of a Cu atom in pm?
10. ### Chem

Pure gold adopts a face-centered cubic crystal structure. It also has a density of 19.30g/mL. What is the edge length of gold's unit cell?

More Similar Questions