Element Compound Mixture • Made of ONE kind of atom (found on the periodic table) • Cannot be separated into any simpler form chemically or physically • Made of 2 or more kinds of atoms chemically combined in a certain ratio (e.g water molecule is 2 hydrogens and one oxygen atom) • 2 or more elements or compounds mixed together physically.
the type of elements and quantity of atoms involved in a molecule. ... Some concepts you'll be tested on include subscripts and number of atoms in a molecule. Quiz & Worksheet Goals.