Alex LeMay



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Atomic History and Nuclear Chemistry Studyguide Worksheet

I. Atomic History

Write in their contribution to understanding the atom.

1. Plato and Aristotle

2. Democritus (460-370 BCE) and his teacher Leucippus

3. Antoine Lavoisier (1743-1794)

4. Joseph Proust (1754-1826)

5. John Dalton (1766-1844)

6. William Crookes (1832-1919)

7. J.J. Thomson (1856-1940)

8. Robert Millikan (1868-1953) (RANDOM - NOT ON TEST)

9. Wilhelm Roentgen (1845-1923)

10. Henri Becquerel (1852-1908)

11. Ernest Rutherford (1871-1937)

12. Hans Geiger (1882-1945)

13. Ernest Marsden (1889-1970)

14. James Chadwick (1891-1972)

II. Chemistry Laws (observations of nature)

Match the laws with their definition.

A. Law of Conservation of Mass

B. Law of Definite Proportion

C. Law of Multiple Proportions

_____1. You can have different proportions of elements in a compound , but it means

you’ll end up with a different compound each time.

_____2. In a reaction, nothing is created or destroyed; the mass of the reactants before

the reaction is the same as the mass of the product after the reaction.

_____3. Compounds are made of a definite proportions of elements.

4. Which law above would describes the situation below? Law of _____________________________________

I have 4 atoms of lead and 4 atoms of sulfur. I combine them and get 4 units of lead sulfide compound. However, if I combine 4 atoms of lead and 6 atoms of sulfur, I still get 4 units of lead sulfide compound, but I also have 2 atoms of sulfur left over.

III. Inside the Atom

Fill in the blanks.

1. Radiation

Particle Symbol Made of Charge Mass

alpha 2 protons

2 neutrons _______ _____

_______ _________ negative 1/1837 amu

gamma elec.-mag.wave _______ none

2. Part of the Atom

Particle Symbol Mass Charge Location

Proton ______ 1 amu _______ nucleus

______ n0 1 amu 0 __________

Electron e- _______ - 1 __________

3. Amu stands for _______________________________________________________ and it is defined as the mass of one ______________________.

IV. Forces and other particles.

Fill in the blanks.

universal forces quarks bosons leptons antiquarks

______________1. Protons and neutrons are made of __

______________2. Electrons are one of six kinds of __,

______________3. The antimatter version of a quark is a __.

______________4. A __ carries messages between particles.

______________5. There a four _____ that messenger particles carry.

V. Reading a Periodic Table Square

Use the periodic table square below to answer the following questions.

1. What is the name of this element?

2. What is its atomic symbol?

3. What is the average atomic mass?

4. What is the atomic number?

5. How many protons does it have?

6. How many electrons does it have?

7. How many neutrons does it usually have?

8. What is the most common isotope?

Extra Credit

1. Give the specific ingredients needed to make a proton.

2. Name all four universal forces and what they do.

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