# Question #9fe6f

##### 1 Answer

#### Answer:

We calculate the mass and the volume of a unit cell, and then we calculate its density to be

#### Explanation:

**Calculate the number of atoms in the unit cell.**

The unit cell of polonium is a simple cube:

It has a

But how many **inside** the cube?

Here's a cutaway diagram of the cube itself.

We see that there is only one-eighth of a Po atom at each corner.

Since there are 8 corners,

**Calculate the mass of the unit cell**

**Calculate the volume of the unit cell.**

The formula for the volume of a cube is

**Calculate the density of the unit cell**

Since density is an **intensive property**, this is also the density of the bulk metal.