1. A t o m i c S t r u c t u r e Part 3

2. Recap

5. Recap 2 nd shell 8 electrons 4 th shell 8 electrons Nucleus 3 rd shell 8 electrons (proton number 20) 1 st shell 2 electrons

7. Overview of topic Structure of Atoms Isotopes Electronic Arrangement Electronic Structure and the Periodic Table Ions Atomic Structure

9. What are outermost electrons

12. What are outermost electrons Example 4 6 3 4 6 3 2, 6 2, 4 2, 8, 3 Electronic Configuration Oxygen Carbon Aluminium No. of e - taking part in chemical reactions No. of outermost e - (Valency) Element

13. Electronic Structures & The Periodic Table

16. Electronic Structures & The Periodic Table 2, 8, 5 P 5 2, 5 N V 2, 8, 4 Si 4 2, 4 C IV 2, 8, 3 Al 3 2 ,3 B III 2, 8, 2 Mg 2 2, 2 Be II 2, 8, 1 Na 1 2,1 Li I Valency Electronic Configuration Example Group

17. Electronic Structures & The Periodic Table 2, 8, 7 Cl 7 2, 7 F VII 2, 8, 6 S 6 6 O VI Valency Electronic Configuration Example Group

18. Electron Structure of Noble Gases

22. Practice Time

23. Ions

29. Why do atoms lose or gain electrons

30. Why do atoms lose or gain electrons Atoms lose or gain electrons so as to achieve the stable full shell configuration of a noble gas i.e. duplet (2 e - in the outermost shell) or octet (8 e - in the outermost shell)

31. Practice Time

32. Summary

39. Any Questions