1. STARTER
Complete the word wheel. Write the keywords in a short paragraph but they must be in the order of the word wheel.
Electrons
Atomic Mass
Protons
Isotopes
Neutrons
You can start anywhere on the word wheel.

2. Learning Outcomes
understand that the Periodic Table is an arrangement of elements in order of atomic number deduce the electronic configurations of the first 20 elements from their positions in the Periodic Table deduce the number of outer electrons in a main group element from its position in the Periodic Table.

3. On Mini - white boards What are the number of protons,
neutrons and electrons for:
Hydrogen.
Boron.
Sodium.

4. Hydrogen Atom
1 Protons
0 Neutrons
1 Electron

5. Boron Atom
5 Protons
6 Neutrons
5 Electron

6. Sodium Atom
11 Protons
12 Neutrons
11 Electron

7. x x x 1st shell holds up to 2 electrons HELIUM HYDROGEN
2p 2n 1p x
HYDROGEN
1 proton, 1 electron
HELIUM
2 protons, electrons, neutrons

8. Rules for filling shells
In HELIUM, the outer shell is FULL. This shell only holds up to 2 electrons.
We need to start on a new shell. This holds up to 8 electrons.
Try to draw the atoms for lithium up to neon.

9. x x x x x LITHIUM BERYLLIUM 3 protons, 3 electrons, 4 neutrons

10. x x x x x x x x x x x BORON CARBON 5 protons, 5 electrons, 6 neutrons

11. x x x x x x x x x x x x x x x OXYGEN NITROGEN7p 7n 8p 8n x x x x x x x x
OXYGEN
8 protons, electrons, neutrons
NITROGEN
7 protons, electrons, neutrons

12. x x x x x x x x x x x x x x x x x x x NEON FLUORINE9p
10n
10p
10n x x x x x x x x x x x
NEON
10 protons, electrons, neutrons
FLUORINE
9 protons, electrons, neutrons

13. Rules for filling shells
In NEON, the outer shell is FULL.
We need to start on a new shell. This also holds 8 electrons.
Try to draw the atoms for sodium up to calcium.

14. Have a look at this table –what does it tell us about each element
Have a look at this table –what does it tell us about each element? Must refer to periodic table
Element no.
Symbol
Shell1
Shell2
Shell3
Shell4 1 H 2 He 3 Li 4 Be 5 B 6 C 7 N 8 O 9 Fl 10 Ne
Valence electrons – group number
Number of shells – period number

15. Question! Have a look at the diagram on the right…
What do you think these numbers mean?
Discuss in pairs.

16. Electron configuration
Work out the numeric format for the following elements:
Carbon
Sodium
Flourine
Magnesium
Argon

17. Answers
Carbon: 2,4 Sodium: 2,8,1 Fluorine: 2,7 Magnesium: 2,8,2 Argon: 2,8,8

18. Complete worksheet
Periodic table basics worksheet

19. Group Task
As a class:
Can you arrange yourselves to show the Atomic structure of NITROGEN including the correct electrons in each shell?
You have 3 minutes!

20. Can you find the four mistakes and correct them?
The proton number of an element tells you how many protons or neutrons each atom has.
The first electron shell of an atom can only hold four electrons.
The second and third shells can hold up to 9 electrons each.
An electron shell doesn’t have to be full before you start adding electrons to the next shell up.

21. Octet rule
All atoms want to have a full outer shell like neon and Argon etc.
To do this Atoms gain or loose electrons

22. Task
For the following state whether it’ll be easier to gain or loose electrons
Eg its easier to gain 3 rather than loosing 5

23. Gain?
Lose?

24. Lose
2 electrons

25. Gain?
Lose?

26. Gain
2 electrons

27. Gain?
Lose?

28. Gain
1 electron

29. Gain?
Lose?

30. Gain
3 electrons

31. Gain?
Lose?

32. Lose
3 electrons

33. Gain?
Lose?

34. Lose or Gain
1 electron

35. Draw the electron configuration of the following
Sodium ion
Chlorine ion
Nitrogen ion
Oxygen ion
Magnesium ion
Boron ion
Note: original electrons in dots and new electrons in crosses