1. The Greek philosophers, Leucipus and Democritus, suggested that everything, including us, was made of tiny indivisible particles - called atoms a = not tomos = cut

2. but it was John Dalton, who lived in Manchester, who proved it more than 2000 years later

3. Dalton’s drawings of atoms

4. Paper read to the Manchester Literary and Philosophical Society, 20 th October 1803

5. 1/3 nm CO 2

6. C + O 2 → CO 2 The arrow is at least as important as it describes the chemical reaction

7. Paper read to the Manchester Literary and Philosophical Society, 20 th October 1803 HNCOHNCO

8. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. http://en.wikipedia.org/wiki/John_Dalton

9. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element http://en.wikipedia.org/wiki/John_Dalton

10. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element 3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.chemical compounds http://en.wikipedia.org/wiki/John_Dalton

11. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element 3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.chemical compounds 4.Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.chemical reaction http://en.wikipedia.org/wiki/John_Dalton

12. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element 3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.chemical compounds 4.Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.chemical reaction 5.Elements are made of tiny particles called atoms.atoms http://en.wikipedia.org/wiki/John_Dalton

13. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element 3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.chemical compounds 4.Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.chemical reaction 5.Elements are made of tiny particles called atoms.atoms Dalton proposed an additional "rule of greatest simplicity" that created controversy, since it could not be independently confirmed. http://en.wikipedia.org/wiki/John_Dalton

14. Five main points of Dalton's atomic theory 1.The atoms of a given element are different from those of any other element; the atoms of different elements can be distinguished from one another by their respective relative atomic weights. 2.All atoms of a given element are identical.element 3.Atoms of one element can combine with atoms of other elements to form chemical compounds; a given compound always has the same relative numbers of types of atoms.chemical compounds 4.Atoms cannot be created, divided into smaller particles, nor destroyed in the chemical process; a chemical reaction simply changes the way atoms are grouped together.chemical reaction 5.Elements are made of tiny particles called atoms.atoms Dalton proposed an additional "rule of greatest simplicity" that created controversy, since it could not be independently confirmed. When atoms combine in only one ratio, "..it must be presumed to be a binary one, unless some cause appear to the contrary". http://en.wikipedia.org/wiki/John_Dalton

16. HNHN COCO

17. HO HNHN COCO

18. HN HNHN COCO

19. HOHNNO HNHN COCO

20. HOHNNOHC HNHN COCO

21. HOHNNOHCOC HNHN COCO

22. HOHNNOHCOC NON HNHN COCO

23. HOHNNOHCOC NONONO HNHN COCO

24. HOHNNOHCOC OCONONONO HNHN COCO

25. HOHNNOHCOC OCO HCH NONONO HNHN COCO

26. HOHNNOHCOC OCO HCH NONONO NO 3 HNHN COCO

27. Dalton was the first Nanotechnologist So

28. Five main points of Dalton's atomic theory http://en.wikipedia.org/wiki/John_Dalton

30. CO 2

31. John Dalton

33. Paper read to the Manchester Literary and Philosophical Society, 20 th October 1803

34. NN & Nanoscience Nanotechnology is 200 years old

35. CO 2