1. History of the Atom

2. Early Thoughts

3. Democritus

4. Aristotle

5. John Dalton

6. JJ Thomson

7. Ernest Rutherford

8. To Sum it Up Electron e- In the space surrounding the nucleus Proton p
Particle
Symbol
Location
Relative Electric Charge
Relative Mass
Discovered By
Electron e-
In the space surrounding the nucleus 1-
1/1840
JJ Thomson
Proton p
In the nucleus 1+ 1
Rutherford
Neutron n
Chadwick

9. Atomic Number

10. Atomic Mass Number and Isotopes

11. Calculating Atomic Mass
Naturally occurring europium (Eu) consists of two isotopes was a mass of 151 and Europium-151 has an abundance of 48.03% and Europium-153 has an abundance of 51.97%. What is the atomic mass of europium?
Strontium consists of four isotopes with masses of 84 (abundance 0.50%), 86 (abundance of 9.9%), 87 (abundance of 7.0%), and 88 (abundance of 82.6%). Calculate the atomic mass of strontium.

12. History of the Periodic Table

13. Antoine Lavoisier

14. Advent of Electricity

15. John Newlands

16. Mendeleev and Meyer, and the Periodic Table

17. Robert Moseley

18. Nuclear Chemistry

19. Nuclear Chemistry

20. Nuclear Chemistry