atoms

• Thales of Miletus - Water as the ultimate substance
• Empedocles - Considered air, water, earth, and fire as the 4 essential elements
• Leucippus - First Atomist
• Democritus - Father of Atomism
• Democritus - Atoms were solid and indestructible -”Void”
• Democritus - student of leucippus
• ATOMISM - study of an atom
• ATOMISM - Refers to the philosophy for which all matter is produced from atoms.
• ATOMISM - Rejected by ARISTOTLE
• Aristotle - Rejected atomism
• Epicurus - Hold on to atomism
• Lucretius - Wrote a poem, “On the Nature of Things”
• Lucretius - Reaffirmed the basic concepts of atomism.
• Printing Press - was invented that helped publish and disseminate Lucretius poem.
• ALCHEMY - The idea of changing one substance into another.
• PARACELSUS - Founded the school of iatrochemistry (medical chemistry)
• Robert Boyle - He believed the atoms exist even though they are not visible.
• Robert Boyle - J-Tube experiment
• Antoine-Laurent Lavoisier - Law of Conservation of Mass
• Law of Conservation of Mass - States that in a chemical reaction, the mass is neither created nor destroyed.
• Joseph Louis Proust - Law of Definite Proportions
• Law of Definite Proportions - States that the mass ratio of elements in a chemical compound is always constant.
• John Dalton - Introduced the first “table of elements, ” Published the first true atomic theory.