Brief Timeline of Chemistry

30000 B.c. cave paintings 8000 B.c. agriculture develops 6000 B.c. copper smelting 4000 B.c. copper alloys 2000 B.c. bronze 

Anaximander posits air as primary element Thasles posits water as primary element 

Empedocles posits air, earth, fire and water as four major elements 400 B.c. Democritus leads atomists school, atoms basic form of matter 350 B.c. Aristotle s Meterologica 

300 Emperor Diocletian outlaws chemistry in Roman Empire 

700-1100 height of Arab period work of Geber, A1 Razi, Avicenna 

---