# Evaluate the physical properties of potassium, magnesium, and copper. Select the best choice to use for a building project. Why is this metal the best building material to use?

Oct 26, 2016

Well, copper is commonly used as a roofing material.

#### Explanation:

From this site.

You can see the verdigris, the copper oxidation product, in the given image. That's a beautiful old house.

On the other hand, both sodium and magnesium metals would rapidly oxidize with water.

$N a \left(s\right) + {H}_{2} O \left(l\right) \rightarrow N a O H \left(s\right) + \frac{1}{2} {H}_{2} \left(g\right)$

Sodium is a good deal more active than magnesium, but magnesium would also corrode pdq. Magnesium sheeting would also pose an unacceptably high fire hazard.