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Quiz 1.2 – Atomic Theory
1. What particle has the same mass as a proton?
(1) An electron
(2) A neutron
(3) An alpha particle
(4) The nucleus.
2. What is the charge of the nucleus in an atom of oxygen – 17?
(1) 0
(2) -2
(3) +8
(4) +17
3. Briefly describe Thomson’s experiment and the conclusion he was
able to make from his data.
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4. When the alpha particles bounced back after hitting the gold foil in Rutherford’s experiment, it provided
evidence to support the conclusion that:
(1) The atom contains a small positively charged nucleus.
(2) The atom was mostly empty space
(3) Electrons can be found in orbits around the nucleus.
(4) Electrons exist inside atoms.
5. How many neutrons are there in the nucleus of an atom of carbon – 14? You must show you work for credit!
6. Write the ground state electron configuration for aluminum:
ONE MORE QUESITON ON THE BACK!
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7. Identify the elements in the unknown spectrum. Provide specific evidence to support your conclusion:
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Today’s AIMs
•
•
SWBAT distinguish between valence and non-valence electrons, given an electron configuration. (LT
1.9)
SWBAT draw a Lewis electron-dot structure of an atom. (LT 1.9)
Direct Instruction Practice
Use Reference Table S and the Periodic Table to complete the table below.
Element
Atomic
Number
Ground State Electron
Configuration
Number of Valence
Electrons
Number of NonValence Electrons
Carbon
Titanium
Potassium
Copper
Tellerium
Calcium
Oxygen
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Electron dot-diagrams of various elements in Periods 1-4
Period
Group
1
2
13
14
15
16
1
2
3
4
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17
18
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Period:
1. Describe the pattern you see in the number of valence electrons as you go across a period from left to right?
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2. Describe the pattern you see in the number of valence electrons as you go down groups 1,2,13-17?
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3. Which group is the exception to the pattern you described above? __________________________
What do you note about all the atoms in this group that is the exception?
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Independent Practice
Use Reference Table S and the Periodic Table to answer the following questions. Make sure you explain your
choice when asked to do so.
1. How many valence electrons does an atom of phosphorus have? _______________
2. Draw the Lewis structure for phosphorus in the space provided below:
3. Why is the Lewis structure incorrectly drawn below? Explain and correct the Lewis structure so that is
drawn correctly.
X
4. Draw the Lewis structure for Argon in the space below. Additionally, state the number of valence and
non-valence electrons.
5. A fellow scholar makes the following statement, “An atom of sodium has less total electrons than an atom of
neon due to the fact that sodium’s Lewis structure has only one electron whereas the Lewis structure for neon
has eight electrons.” What is wrong with this scholar’s reasoning? How can this statement be corrected?
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Homework 1.11 – Lewis Structures
1. State the number of valence electrons in an atom of potassium in the ground state?
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Explain your answer:
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*2. Draw a Lewis electron-dot diagram for a sulfur atom in the ground state.
*3. An atom in the ground state contains a total of 5 electrons, 5 protons and 5 neutrons. Determine the lewis
electron-dot diagram that represents this atom? Think! Don’t rush!!!
X
X
X
X
*4. Draw a Lewis electron-dot diagram for an atom of fluorine.
5. Draw a Lewis electron-dot diagram for an atom of silver.
*6. State the number of non-valence electrons found in an atom of chlorine?
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Explain your answer:
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7a. State the ground state electron configuration for an atom of Tellurium.______________________________
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Period:
b. State the number of valence electrons in an atom of Tellurium.______________________________
c. State the number of non-valence electrons in an atom of Tellurium.______________________________
d. Draw a Lewis electron-dot structure for Tellurium.
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Exit Ticket 1.11 – Lewis Structures
*1.
*2. How many valence electrons does an atom of magnesium have in its ground state?
(1) 1
(2) 2
(3) 7
(4) 8
*3. Draw the Lewis structure for an atom of fluorine.
4. For the atom that was drawn above, how many valence electrons does it have? How many non-valence
electrons does it have? Be sure to justify your reasoning.
Number of Valence Electrons: ____________________________
Number of Non-Valence Electron: ________________________
Explain your reasoning: ____________________________________________________________________
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