Maple syrup, which comes from the sap of maple trees, contains water and natural sugars. it's a clear, brown liquid and the sugars can’t be separated by filtration. under which category will you classify it?

Maple syrup would be categorized under solutions. As it contains sugar which is very soluble in water, it dissolves completely in water depending on its solubility at that temperature making it impossible for the components to be filtered out. A solution is a homogeneous mixture.

Outermost (valence) electrons