Atomic Theory of Matter and Its Laws

• Dalton’s atomic theory of matter
• Atoms are small, discreet, indivisible pieces of matter.
• All elements are made up particles called atoms.
• An element’s atoms are identical in size, mass, and chemical properties.
• Scientists did not know about isotopes.
• Isotopes are elemental atoms that differ in their mass due to different number of neutrons..
• Molecules (compounds) are formed when two or more elements are combined.
• Molecules are simple whole-number ratios of the combined elements.