1. QQ:
How can the mnemonic
“Ape Man” help you?
2. A neutral atom has 40 electrons.
How many protons does it have?
What is its atomic number?
What element is it?
What is its atomic mass?
How many neutrons does it have?
3. How can you tell the atomic number from the mass number on a periodic table?

3. Today’s Objective:
I understand the development of current atomic theory.

4. Is it possible to figure out what this is without unwrapping it?

6. Follow instructions carefully.
Do not remove any papers
or look underneath
Figure out the phrase.
Write down a guess.
Remove the top sheet.
Write down your new prediction.

7. How did the information on the sheets change as you moved through the stack?

8. How did the number of letters provided affect your ability to predict the phrase?

9. Describe another situation in which having more data makes it easier to make a prediction.

10. Democritus 400 BC
Unable to be divided

11. Aristotle 400 BC
5 basic elements
Air
Earth
Fire
Water
Ether (space)

12. Dalton 1803
Dalton 1776
All matter is made of atoms which are indestructible spheres
All atoms of a given element are alike & have the same mass and properties

13. Atoms can join together to make compounds
A chemical reaction is the rearrangement of atoms.

14. Thomson 1897
Discovered
subatomic particles

16. Thomson:
Plum Pudding
Model

17. Rutherford 1911
Nucleus has a
positive charge

18. Rutherford: Gold Foil Experiment Nucleus is Positive
Hyperlink to gold foil video
Nucleus is Positive

19. Most particles traveled through
the foil.
Atom is mostly empty space.
Some particles were reflected back.
Nucleus is positively charged.
Nucleus
carries
most of
atom’s mass.
Occasionally
bounced back.

20. Bohr 1913
Electrons move in orbits
Levels farther away from nucleus have more energy

22. Electron Configurations:
Arrangements of electrons around the nucleus based
on their energy level.
Nickel has 28 –e
Different levels hold different numbers of –e

23. Electron Cloud Model Schrodinger 1926
Cloud shows areas where electrons are likely to be found.

24. Schrodinger's Cat

25. A Weird and Wondrous Place

26. Assignment:
Make an article that would be printed in a newspaper of the time announcing the latest development in
atomic theory.
Year
Explain the theory
Scientist(s) involved in development
Summary of previous theories
Picture(s)