Reason: A</span><span> homogeneous mixture seems to only have one substance, when it actually contains more. An example of one is water. It seems to only have one substance, but it contains minerals and </span><span>gases, but these are dissolved in the water.
The diagram is showing a 3d model of an atom, with all of the electrons demonstrated in a rounded shape, which resembles a cloud, thus being called an electron cloud.
