1. Warm Up Write the electron configuration for F.
Then draw the orbital diagram.

2. Bohr’s Model
Shows the total number of electrons in each energy level (shell).
Notice the electrons are paired, just as they are in the orbital diagram.
bohr_atom.gif

3. Relation between shell and subshell
First shell: 1s
Second shell:
2s and 2p
Third shell:
3s, 3p and 3d
Fourth shell:
4s, 4p, 4d and 4f
Predict – 8th shell…
8 subshells!
The number of subshells in equal to the shell (period) number!

4. Total electrons in each shell
First shell:
1s has 2
Second shell:
2s has 2 and 2p has 6 = 8
Third shell:
3s has 2, 3p has 6, 3d has 10 = 18
Fourth shell:
4s has 2, 4p has 6, 4d has 10, 4f has 14 = 32

5. Draw Bohr’s model for… H Predict the change for Li
Why is the electron green?
Because it is in an s orbital! (outlined in green)

6. Draw Bohr’s model for… H Li
Predict the change for Na
1s22s1

7. Draw Bohr’s model for… H Li Na Predict the change for K 1s22s22p63s1
We are taking our orbital diagram and cutting apart the separate shells and then bending them into a circle!

8. Draw Bohr’s model for… H Li Na K
What change did you notice in the size of the atom?
Size increased as more energy levels (shells) were added!
1s22s22p63s23p64s1

9. Draw Bohr’s Model for… Li Be B C N O F Ne
Predict the change that will occur as we go across the second period.
What occurred at the particle level across this period?
Added an additional electron AND an additional proton.

10. Atomic Radius Trend
Across a period, the atomic radius decreases due to the increased effective nuclear charge.
There are more protons in the nucleus to attract and pull in the electrons
bgrn1626l.jpg
650px‑AtomicRadius.png

11. Down a family, the atomic radius increases, due to the additional energy levels (shells)
650px‑AtomicRadius.png

12. Research Groups of 1 to 4 Research either Make a claim
Electronegativity
Electron affinity
Ionization energy
Make a claim
How does the term relate to atomic radius trend
Give your evidence
Insert pictures of your findings
Explain your reasoning
This is where your VOICE comes into play
Make a video of your claim, evidence and reasoning using educreations.