Download Chemistry I Unit Review: The Atom Text Chapters 2 and 7 1. The

Chemistry I
Unit Review: The Atom
Text Chapters 2 and 7
1. The History of the Atom (what contribution did each make to increase our knowledge of the atom?)
Democritus
Dalton
Thomson
Rutherford
Bohr
Electron Cloud Model (what is it?)
Lavoisier—Law of Conservation of Matter
2. Atomic Structure
How many protons are in the nucleus of each of the following elements? (also known as the atomic number)
a. uranium
c. helium
b. selenium
d. bohrium
Give the number of neutrons in each of the following isotopes. (what is an isotope?)
a. titanium-46
c. 3416S
b. nitrogen-15
d. 6529Cu
Fill in the blanks in the table below for neutral atoms. Use only the information given in the table.
Atomic Number
calcium--43
lead—211
plutonium—242
chromium--50
Mass Number
Number of
Protons
Number of
Neutrons
Number of
Electrons
20
129
94
3. Lewis Dot Diagrams
What is a valence electron?
How many electrons can each of the first 3 energy levels contain?
Determine the number of valence electrons and draw the dot diagram for the following atoms:
Na
C
S
Cl
Ar
4. Emission Spectrum
How can it be produced (what is happening with the electrons) and why is it useful?
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