HISTORY OF THE DISCOVERY OF ATOMS LECTURE
Essential Question: What is the timeline of the discovery of the atom and its subatomic particles?
Learning Objective: The discovery of atoms and their subatomic particles involves the work of many scientists since 400 BC until now.
SWBAT:
- Create a timeline of the discovery of atoms and subatomic particles
HMMM... BE READY TO PARTICIPATE
- Provide the names of at least 5 scientists who helped develop our current knowledge of atoms
BRIEF TIMELINE HISTORY OF THE DISCOVERY OF THE ATOM
JJ THOMSON
- "PLUM PUDDING MODEL" OF AN ATOM
- "CATHODE RAY TUBE" EXPERIMENT
- DISCOVERED ELECTRONS
https://www.youtube.com/watch?v=2xKZRpAsWL8 - CATHODE RAY TUBE
https://www.youtube.com/watch?v=JUJPyQtoB5E - PLUM PUDDING MODEL
https://www.youtube.com/watch?v=Rb6MguN0Uj4 - TYLER DEWITT
ERNEST RUTHERFORD
- "NUCLEAR MODEL" OF AN ATOM
- "GOLD FOIL EXPERIMENT"
- DISCOVERED THE NUCLEUS
- DISCOVERED THE PROTONS INSIDE THE NUCLEUS
https://www.youtube.com/watch?v=dNp-vP17asI - TYLER DEWITT
https://www.youtube.com/watch?v=IQ1h_gdVlHg
https://www.youtube.com/watch?v=XBqHkraf8iE&t=92s
NIELS BOHR
- "PLANETARY MODEL" OF AN ATOM
- DISCOVERED WHY ELECTRONS ARE NOT ATTRACTED TO THE NUCLEUS
https://www.youtube.com/watch?v=LA9juHlyhKw
ERWIN SHRODINGER
- "THE CLOUD MODEL" OF AN ATOM
- "QUANTUM MECHANIC"
https://www.youtube.com/watch?v=BMIvWz-7GmU
https://www.youtube.com/watch?v=TQKELOE9eY4
https://www.youtube.com/watch?v=fP2TAw7NnVU - Quantum Mechanics
SUMMARY OF THE TIMELINE BY TYLER DEWITT
https://www.youtube.com/watch?v=NSAgLvKOPLQ&t=497s
GRIZZLIES,
WATCH TYLER DeWITT VIDEO "MODELS OF THE ATOM TIMELINE" AND COMPLETE THE TABLE WITH THE INFORMATION PROVIDED IN THE VIDEO
https://www.youtube.com/watch?v=NSAgLvKOPLQ&t=575s
PRESENTATION:
PROVIDE AS MUCH INFORMATION AS POSSIBLE
USE BULLET POINTS FOR EACH INFORMATION YOU ARE PROVIDING
MAKE SURE TO INCLUDE THE NAME OF THE MODELS AND THE NAME OF THE EXPERIMENTS PERFORMED BY THESE SCIENTISTS
LINK:
https://drive.google.com/file/d/1WXE2uNnLtT5mDoyVfyvH0kHicJjEf09L/view?usp=sharing
https://drive.google.com/file/d/1U_jrVFriuRHFLJsFaWmAwpAp3LDS3LVJ/view?usp=sharing
Grizzlies,
Read the assignment above and submit after answering all the 20 questions based on the reading part.
Atomic Models Timeline Webquest
Part I – Models of the Atom
Democritus
Click the following link: http://thehistoryoftheatom.weebly.com/democritus.html
- How did Democritus come to his conclusions about the atom?
- Write two contributions Democritus gave to modern science
Dalton
Click the following link: http://www.iun.edu/~cpanhd/C101webnotes/composition/dalton.html
1. List the 4 ideas of Dalton’s Atomic Theory
2. Is the atomic theory still valid today? Explain
3. Why is he important in regards to atomic theory?
J.J. Thomson
Use the lecture notes and the videos in the lecture to answer these questions.
- What “name” is given to his model? _________________ .
- DESCRIBE his model in the space below.
- What type of rays did he use to determine the presence of electrons?
- What experiment did he do?
Rutherford
Use the lecture notes and the videos in the lecture to answer these questions.
- How did Rutherford describe the atom?
- What experiment did he do? Describe the experiment.
Bohr and Schrodinger
Click on the following link: http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html
- Explain Bohr’s “planetary model”. Where are the neutrons and protons? Where are the electrons?
- Complete the blanks with information from the site. Each orbit around the nucleus represents an ________________________. Electrons cannot exist between _________________.
- What happens to the energy levels of the orbitals as you move further from the nucleus?
- Bohr’s model was an improvement over the older models because he recognized that electrons had to be in _____________________ (____________________).
- Bohr’s model needed to be improved upon because it did not work for atoms that were _______________ than Hydrogen.
- Schrodinger predicted that electrons had electromagnetic energy, meaning that they can behave both like a ________________ and a _________________.
- Instead of having electrons in specific orbits, they were placed in clouds in Schrodinger’s model. In the cloud model can scientists predict where an electron is? Explain.
9. Can an electron be found in an exact spot within an atom?
Part II – Summarizing The Story So Far
- What major changes occurred from Democritus’s model to Thomson’s model?
- What major changes occurred from Thomson’s model to Rutherford’s model?
- What major changes occurred from Rutherford’s model to Bohr’s model?
- What changed from Bohr’s model to the electron cloud model?
Part III – What is an Atom?
Click the following link: http://www.qrg.northwestern.edu/projects/vss/docs/Propulsion/1-what-is-an-atom.html . Read the top paragraph (only) and answer the following questions:
- Everything in the universe (except energy) is made up of ______________________ .
- Therefore, everything in the universe is made up of ___________________.
- An atom itself is made up of three tiny kinds of particles called subatomic particles: ___________,
________________ and __________________ .
4. The protons and the neutrons make up the ________________ called the nucleus.
5. The _____________________ fly around above the nucleus in a small cloud.
6. The electrons carry a ________________ charge and the protons carry a ___________________charge.
7. In a normal (neutral) atom the number of protons _____________________ the number of electrons.
