1. The Current Atomic Model

2. Atomic Structure All Material are ultimately made up of atoms.
Atoms are the smallest ‘building block’ of matter.
Each element has a set number of protons eg. Hydrogen has 1 proton, Helium 2 protons and Gold 79 protons

3. Atomic Structure Electrons in shells The Nucleons in the Nucleus
Proton
Neutrons

4. C 12 6 The total number of protons and neutrons
in an atom is called its mass number. C 12 6
The number of protons in an atom is called its atomic number.

5. Number of Electrons = Number of Protons
In a atom…
Number of Electrons = Number of Protons

6. Electron Configuration

7. Electron Configuration
The first shell can hold 2 electrons
The second shell can hold 8 electrons
The third shell can hold 8 electrons
The fourth shell can hold 2 electrons
The electrons always fill up the lowest shell before any other

8. H

9. He

10. Li

11. Be

12. B

13. C

14. N

15. O

16. F

17. Ne

18. Na

19. Mg

20. Al

21. Si

22. P

23. S

24. Cl

25. Ar

26. K

27. Ca

28. Number of Electrons = Number of Protons
In a atom…
Number of Electrons = Number of Protons
This means atoms are electrically neutral
If electrons are added or removed then the atom becomes a charged particle we call an ion

29. Sodium
Atom
Chlorine
Atom

30. Positive
Sodium
Ion
Negative
Chlorine
Ion