Chemistry Webquest #1: Introduction to Atoms Worksheet



Atomic Models Timeline Webquest

Part I – A BRIEF History of the Atom

Click the following link: . There is one time line that comes up and others that are listed near the bottom of the page under “related sites”. After you find what you think Use the information on these web pages 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 |

| |

|Scientist | | | | |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.

3. Why is he important in regards to atomic theory?

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. (label)

2. What type of rays did he use to determine the presence of electrons?

3. What experiment did he do?

Rutherford

1. How did Rutherford describe the atom?

2. What experiment did he do? Describe the experiment.

Click the following link:

Listen to the instructions.

3. After hearing about the results of the gold foil experiment, explain the experiment’s findings.

4. 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.

Click the following link:

9. How is Schrodinger’s model DIFFERENT from Bohr’s? _________________________________

___________________________________________________________________________________

10. Can an electron be found in an exact spot within an atom? ____________________

Part III – Summarizing The Story So Far……….

1. What major changes occurred from Democritus’s model to Thomson’s model?

2. What major changes occurred from Thomson’s model to Rutherford’s model?

3. What major changes occurred from Rutherford’s model to Bohr’s model?

4. What changed from Bohr’s model to the electron cloud model?

Part IV – What is an Atom?

Click the following link: Read the top paragraph (only) and answer the following questions:

1. Everything in the universe (except energy) is made up of ______________________ .

2. Therefore, everything in the universe is made up of ___________________.

3. 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.

Finished? Click the following link to quiz yourself on what you’ve learned

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