Chemistry Webquest #1: Introduction to Atoms Worksheet



Introduction to Atoms and Atomic Scientists

Directions - 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. There are many additional scientists that contributed to the atomic model. I only expect you to recognize about six of them.

History of the Atom Timeline

|1 |2 |3 |4 |5 |6 | |Date:

|460 BC | | |1911 |1913 | | |Scientist: | |John Dalton |

Mendeleev | |** (you will find out about this scientist soon…)

|Schrodinger | |Contribution: |

| | | | | | |

Directions - Part II – Models of the Atom

Click the following link:

1. Where was Democritus from? ____________________________

2. Why is he important with regard to atomic theory? ________________________________________________________________________________________________________________________________________________________________________

Click the following link:

1. What are the four parts to Dalton’s Theory

a. ____________________________________________________________________________________________________________________________________________________________

b. ____________________________________________________________________________________________________________________________________________________________

c. ____________________________________________________________________________________________________________________________________________________________

d. ____________________________________________________________________________________________________________________________________________________________

2. Why is he important with regard to atomic theory? ________________________________________________________________________________________________________________________________________________________________________

Click on the following link:

1. Complete the parts of Niels Bohr’s theory of atomic structure:

a. The Bohr model consists of four principles:

i. _____________________________ occupy only certain _______________________ around the nucleus. Those orbits are stable and are called "stationary" orbits.

ii. Each orbit has an _________________________ associated with it. The orbit nearest the nucleus has an energy of E1, the next orbit E2, etc.

iii. _______________________ is ___________________________ when an electron jumps from a lower orbit to a higher one and energy is _________________________ when an electron falls from a higher orbit to a lower orbit.

iv. The energy and frequency of light emitted or absorbed can be calculated by using the difference between the two orbital energies.

2. How is Schrodinger’s model DIFFERENT from Bohr’s? ________________________________________________________________________________________________________________________________________________________________________

3. Can an electron be found in an exact spot within an atom? _________________________________

Directions - Part III – 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:

a. ________________________

b. ________________________

c. ________________________

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.

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download