The document outlines lessons on atomic structure, focusing on ionization energy and its implications for atomic models. It includes concepts like isotopes, energy levels, and trends in ionization energy across periods in the periodic table. Additionally, it provides review questions and resources for further study, along with links to quizzes and video explanations.

1. 12.1- Electrons in atoms

2. Lesson outline…
• Lesson 1- Topic 2 review.
• Lesson 2- What does ionization energy (I.E.)
tell us about the structure of an atom?
• Lesson 3- Topic 2/12 review questions.

3. Lesson 1- Topic 2 review .
Level 4: Recall that an isotope is a variant of an
element due to more or less neutrons.
Level 7: Explain how emission & absorption
spectra were used to come up with the idea of
atomic orbitals (s,p,d etc.)
Level 5/6: determine the % abundance of an
isotope from given data.

4. Topic 2 review
• See worksheet and answers.
• You can also try this quizlet:
https://quizlet.com/167940560/ib-chemistry-
atomic-structure-flash-cards/

5. Lesson 2- What does ionization energy (I.E.) tell us
about the structure of an atom?
Level 4: State what the definition is for first
ionization energy.
Level 7: Explain how trends in successive I.E.
show evidence for energy levels and sub
levels.
Level 5/6: Justify the general trend in first I.E.
for periods 1, 2 & 3.

6. starter
*Task: Redraw this energy
level diagram of a H atom and
then include an arrow to
show ionization of this atom.

7. Ionization energy (I.E.)
The first ionization energy is the energy needed to
remove one mole of electrons from the ground
state of one mole of the gaseous atom.
In short: H(g) H+ (g) + e- KJ.mol-1
https://www.youtube.com/watch?v=0EnK4EXLDUc
(short video clip 1.20min)

8. An important diagram to have in your
head….
• The principle energy levels
are numbered 1,2,3 etc.
• Then you have a certain
number of different orbital
types at each of these
energy levels s,p,d (and f
may be referred to briefly)
• With these orbtials you
then have a certain number
of sub-orbitals/sub-levels
e.g. a p orbital has 3 sub
orbitals.

9. Successive I.E. & ‘principle’ energy levels.
(e.g. Aluminium) *8min to justify using e configs.
Q. Why is there a jump
between the 3rd & 4th and
the 11th&12th I.E.?
Q. Why is there a need for
a log scale on the y axis?

10. Successive I.E. & sub- levels.
(e.g. Aluminium)
(a) Explain, using e-configs, why there is a large increase between the
ninth and tenth I.E.
(b) Explain why the increase between the sixth and seventh values is
greater than the increase between the fifth and sixth values.

12. Trends in first I.E. across a period…
1. What is the general trend in I.E. across a period/row?
2. What is the general trend in I.E. down the periodic table?
3. What is the reason for the anomaly/discontinuity between Be and B
and between N and O? (which is also repeated in row 3)

13. Pearson questions 12.1

15. Topic 2/12 review
See practice questions…..
(from inthinking & Pearson)