Physical properties- such as it's color, weight, etc. Chemical properties- such as ability to rust, flammability, etc.
Yes, it is considered a suspension, im not positive WHY is it, but im positive it is.
they are able to scatter light
You'll have to narrow your topic area quite a lot to receive a good answer. Just a few quick ones though: orbitals, electronegative, density, heat of vaporization, boiling point...
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