1. Question of the Day
Explain why each of the following models was developed:
plum pudding
Rutherford’s
Bohr’s
electron cloud
Day

2. Objective / Essential Question
Day
What does the inside of an atom look like and how do we know?

3. Unit # 3 Test Thursday 12-1
Day

4. Atomic number = protons = electrons (neutral atom)
Ape MAn
Atomic number = protons = electrons (neutral atom)
Mass # = Atomic # + neutrons

5. Parts of Atoms, Isotopes, and Ions
________ atoms that have gained or lost ________
Examples
Iron loses 2 electrons
Chlorine gains 1 electron
Charged
electrons
Fe +2
Cl -1

6. Parts of Atoms, Isotopes, and Ions APPROXIMATE MASS (in amu)
Fundamental parts of atoms
COMPONENT
CHARGE
APPROXIMATE MASS (in amu)
LOCATION IN ATOM
shells
electron
- 1
nucleus
proton
+ 1
1.0
nucleus
neutron

7. Parts of Atoms, Isotopes, + Ions
Individual _____ of any element
Represented with a _______ symbol
atom
nuclear A C
X = _______ _______
A = ____ _______
Z = ______ _______ X
element symbol
mass number Z
atomic number

8. Parts of Atoms, Isotopes, and Ions
X = _______ _______
A = ____ _______
Z = ______ _______
= ______ _______
C = ______ __ __ ___
# neutrons = ___ - ___
# electrons = ___ - ___
element symbol A C X
mass number Z
atomic number
protons number
charge as an ion A Z Z C

9. Parts of Atoms, Isotopes, and Ions
Mass number?
Atomic number?
# of neutrons?
Element?
Charge?
# of electrons? 19 1- X 9

10. Particles of Radioacty. + Nuc. Rxns.
Nuclear Reactions
What forces act in the atom?
______ _______ force holds _______ together
_____ _______ force causes ___________
Natural radioactivity, radioactive decay, or nuclear disintegration is the ___________ …
Strong nuclear
protons
Weak nuclear
radioactivity
spontaneous

11. Particles of Radioacty. + Nuc. Rxns.
Nuclear Reactions
Natural radioactivity, radioactive decay, or nuclear disintegration is the ___________ … ________ of ________ from an element due to instability of the _______.
spontaneous
emission
radiation
nucleus

12. Particles of Radioacty. + Nuc. Rxns.
Nuclear Reactions
Problems in nuclear stability occur when there are too few or too many ________.
All elements with an atomic number greater than ___ are radioactive.
neutrons 83

13. Unit 3 Practice # 2
Assignment:
#s 26, 27, 30, 31 on page 119
Assignment # 1 Unit 3
MAKE UP WORK!!!

14. Q of the Day
Day
Draw a nuclear symbol for an element with 17 protons, 18 neutrons, and 18 electrons
What element is it?
What is the atomic #?
What is the mass #?
What is the charge?

15. Quick Talk
Rutherford’s model
Bohr’s model
Electron
J.J. Thomson
Nucleus
Strong Nuclear Force
Chadwick
Dalton
Plum pudding model
Democritus

16. Quick Talk
Atom
Mass number
Neutron
Ion
Electron cloud
Quark
Isotope
Proton
Atomic number
Energy level
Empty space
Gold Foil Experiment

17. Unit 3 Practice # 2 – due today (Wed. 11-23)
Review
Unit 3 Practice # 2 – due today (Wed )
#s 26, 27, 30, 31 on page 119 – due Tuesday 11-22
Assignment # 1 Unit 3 – due Monday 11-21
Day

18. Notebooks
Timelines
Test
M.P. Grades

19. Model Jigsaw
Explain the parts of the model and specifically what each part represents.
Explain how or why the model was developed.
Explain what it represents well (its strengths as a model).
Explain some of its limitations (its weaknesses).

20. Model Jigsaw
Explain the parts of the model and specifically what each part represents.
Explain how or why the model was developed.
Explain what it represents well (its strengths as a model).
Explain some of its limitations (its weaknesses).

21. Q U I C K T A L K Thomson Atom Proton Electron cloud
Law of Definite Proportions
Bohr
Dalton
Plum Pudding model
Neutron
Alchemists
Mendeleev

22. We have Atoms! - 1850’s Cathode Ray Tubes
Important?

23. Parts of Atoms, Isotopes, and Ions
Mass number?
Atomic number?
# of neutrons?
Element?
Charge?
# of electrons? 42 2+ X 20

24. Thomson’s model of the atom was the first to show _________.
Q of the day
11-16
Thomson’s model of the atom was the first to show _________.
One thing that Thomson’s model showed incorrectly or not at all?

25. What information can you obtain from a nuclear symbol?
Q of the Day
11-19
Rutherford and Soddy showed that radioactivity produces new ________________.
What information can you obtain from a nuclear symbol?
What is the last thing you have in your notes?

26. Particles of Radioacty. + Nuc. Rxns.
Particles of Radioactivity
TYPE
SYMBOL
CHARGE
ALIAS
PENING. ABILITY
alpha
beta
gamma 
helium
nucleus
low: stopped by paper +2
4He 2 
medium: stopped by clothes
- 1
electron 0e
- 1
high: stopped by thick lead and concrete 
light
energy

27. Particles of Radioacty. + Nuc. Rxns.
Particles of Radioactivity
TYPE
SYMBOL
CHARGE
ALIAS
PENING. ABILITY
positron
proton
neutron
short-lived 0e
positive
beta
+ 1
+ 1 1H
+ 1
hydrogen
nucleus 1 1n

28. Particles of Radioacty. + Nuc. Rxns.
Nuclear Reactions
The beta () particle has a ________ charge. How can it be released from the nucleus?
The electron flies away
as beta radiation!
The proton stays in the nucleus!
negative
A neutron splits into a proton and an elec.!
1n → 1p e –
- 1 1