1. By: SarahGrade 8

2. Atoms are the smallest particles that can exist and represent an elements identity.The smallest part you can break Helium (an element) into and still have Helium.Atoms cannot be created or destroyed. 3. Elements Compounds Element is a substance A compound is a substancethat contains only one which contains two or morekind of atom.kinds of atoms.HydrogenMolecule 4. Elements or compounds combine to make molecules. 5. All matter is made up of molecules Matter is the substance of which all material things are made.All living or dead things are made up of matter.Planets, rocks, air, plants, animals, humans.Matter can be directly experienced through the senses. 6. electron cloud 7. Atoms consist ofprotons, neutrons, electrons Protons have a positivecharge and reside in thenucleus. Electrons have a negativecharge and orbit aroundthe nucleus forming anelectron cloud. Neutrons have no chargeand reside in the nucleus 8. The number of electrons , which is the same as the numberof Protons, defines the size of the atom OxygenNitrogenThe mass of an atom is determined by the number of protons andneutrons.IronHelium 9. LithiumProtons along with theneutrons make up most Electrons have no mass of the mass of the atom.