Which metals float?

The densities of eight metals are listed. You will write a test for floating on water, list the metals that float, and find the densest metal. Then the program draws the densities with a line for water.

The idea. Water has a density of $1.00\ \text{g/cm}^3$. Anything less dense floats on it.

Your tasks.

1. In floats, return True if the density is less than that of water.
2. Fill floaters with the names of the metals that float.
3. Find densest, the name of the metal with the greatest density.