1. John Dalton of Manchester first showed that everything was made of atoms October 1803

2. You are all made of very tiny atoms

3. An Atom

4. Atoms

6. .
Atoms are so tiny that even large ones can only just be “seen” with the most powerful microscopes

7. Your main atoms are

8. Your main atoms are
Carbon atoms C

9. Your main atoms are
Carbon atoms
Nitrogen atoms C N

10. Your main atoms are
Carbon atoms
Nitrogen atoms
Oxygen atoms C N O

11. Carbon atoms Oxygen atoms Hydrogen atoms C N O H Your main atoms are
Nitrogen atoms
Oxygen atoms
Hydrogen atoms C N O H

12. Atom stick together to make molecules

13. Two hydrogen (H) atoms attached to an Oxygen (O) atom
A water molecule
Two hydrogen (H) atoms attached to an Oxygen (O) atom

14. In water vapour the molecules are very far apart but in liquid water the molecules, which are somewhat “sticky”, are close together

15. In air there are

16. In air there are
oxygen molecules O O

17. In air there are
oxygen molecules
and
nitrogen molecules O O N N

18. A water molecule has one oxygen atom stuck to two hydrogen atoms

19. That’s why it is called H2O

20. Water molecules are also very very tinyH H

21. There are a LOT of tiny water molecules in a glass of water

22. You are all made out of lots and lots of very tiny molecules

23. Penicillin is one of the most important molecules we have ever discovered

24. One of the prettiest molecules is the Buckyball

25. It has 60 carbon atoms and is the same shape as a football

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

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

30. O=C=O
Carbon Dioxide
CO2
Carbon
Oxygen
Paper read to the Manchester Literary and Philosophical Society, 20th October 1803

31. 1/3 nm
CO2

32. Carbon
Oxygen
O=C=O
Carbon Dioxide
CO2

33. There are a LOT of tiny water molecules in a glass of water

34. You are all made of very tiny atoms