Chemistry Webquest #1: Introduction to Atoms Worksheet
Atomic Models
Part I – A BRIEF History of the Atom
Click the following link: Use the information in this web page to fill in your History of the Atom Timeline. Use the following clues to help you. Make sure that all of the dates and all of the inventors are filled in.
Hints
1. My famous quote was disputed by Aristotle, although time proved me correct.
2. Name the date and inventor of the modern version of the Atomic Theory
3. He developed the plum pudding model and also was the first to discover the electron .
4. In 1909 this scientist demonstrated that the atom is mostly empty space with a small positively charged nucleus containing most of the mass and low mass negatively charged particles orbiting this nucleus.
5. What date did Neils Bohr developed the first successful model of the atom?
History of the Atom Timeline
| |1 |2 |3 |4 |5 |6 |
| Date: |400 BC | | | | |1928 |
| |
|Inventor: | | | | |Bohr |Schrodinger |
Part II – Models of the Atom
Democritus
Click the following link:
1. Complete the following statement “They believed that everything in the _____ was composed of atoms.... There were an ____________ of atoms.... Atoms differed as to their size, shape, and perhaps their weight.”
2. How did Democritus come to his conclusions about the atom?
Dalton
Click the following link:
1. List the 4 ideas of Dalton’s Atomic Theory
1.
2.
3.
4.
2. Is the atomic theory still valid today? Explain.
Thomson
Click the following link: . .
1. Scroll down to JJ Thomson’s Model of the Atom. What “name” is given his model? _________________ . SKETCH his model in the space below.
2. What type of rays did he use to determine the presence of electrons?
Rutherford
3. How did Rutherford describe the atom?
Click the following link:
Listen to the instructions.
4. After hearing about the results of the gold foil experiment, explain the experiment’s findings.
5. Click on “Rutherford’s model”, listen to the description and draw his model below.
Bohr and Schrodinger
Click on the following link:
1. Explain Bohr’s “planetary model”. Where are the neutrons and protons? Where are the electrons?
2. Complete the blanks with information from the site. Each orbit around the nucleus represents an ________________________. Electrons cannot exist between _________________.
3. What happens to the energy levels of the orbitals as you move further from the nucleus?
4. Bohr’s model was an improvement over the older models because he recognized that electrons had to be in _____________________ (____________________).
5. Bohr’s model needed to be improved upon because it did not work for atoms that were _______________ than Hydrogen.
6. Schrodinger predicted that electrons had electromagnetic energy, meaning that they can behave both like a ________________ and a _________________.
7. 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.
8. Draw a picture of the Bohr model and the Schrodinger model below.
Finished? Click the following link to quiz yourself on what you’ve learned
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