How planets look like,and maybe How the planets were created
The answer is B because it's 80 percent copper, that's a greater number then 20.
Answer:

Explanation:
Mass of a proton, 
Mass of an electron, 
The distance between the electron and the proton is, 
We need to find the mutual attractive gravitational force between the electron and proton. The gravitational force is given by :

Where G is the universal Gravitational constant

So, the force between the electron and proton is
.