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# Electron-Dot Diagrams & Properties - Topic Review

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Instructions: Answer the following questions, based on your knowledge of electron-dot diagrams.

1.
Lewis-dot diagrams can help to visually represent valence electrons in an atom.
2.
The electron-dot diagram below represents which of the following?
1. All of the electrons in sodium
2. The valence electrons in sodium
3. The electrons in the first energy level
4. None of the above
3.
In which group would you place the element below?
1. Group 1
2. Group 7
3. Group 17
4. Group 18
4.
Which of the following elements can react with the element shown to form a configuration equivalent to that of a noble gas?
1. Sodium
2. Aluminum
3. Magnesium
4. Copper
5.
What is the oxidation state of the element shown?
1. 8
2. 0
3. 18
4. 36
6.
What is the number of electrons in an ion of the following element?
1. 1
2. 2
3. 0
4. 8
7.
What is true about the following element?
1. It gains 3 valence electrons to form an ion.
2. It loses 5 valence electrons to form an ion.
3. It loses 3 valence electrons to form an ion.
4. It gains 5 valence electrons to form an ion.
8.
Based on the number of valence electrons shown in the diagram, what is the probable charge of the ion formed by this specific element?
1. 0
2. +5
3. -5
4. -3
9.
Given the number of valence electrons shown in the diagram, what can you conclude about this element?
1. It is nonreactive.
2. It only reacts with elements with 6 valence electrons.
3. It is reactive with elements that have 1 valence electron.
4. None of the above
10.
In which group would elements like boron and gallium be found?
1. 13
2. 3
3. 5
4. 8
11.
Which electron-dot diagram shows an alkaline earth metal?
12.
Which electron-dot diagram shows an alkali metal?
13.
Assuming that an atom of calcium is present, as shown in the image, answer the following questions:

(a) Identify the nonmetal in Group 15 that will react with calcium to form an ionic compound, with ions that have an electron configuration identical to that of argon.

(b) Identify the chemical formula of the ionic compound formed from the metal and the nonmetal, based on your answer to part (a).
• (a) phosphorus (or P)

(b) $Ca_3P_2$
14.
Explain what this is a picture of.
• It is a chlorine atom with 7 valence electrons.
15.
An element reacts with nitrogen to form a compound with the formula $X_3N_2$ and an electron configuration identical to that of the noble gas shown.

(a) Based on the configuration of the noble gas shown and the formula for the ionic compound formed, determine the most probable identity of this element, which exists in Period 3.

(b) Draw the Lewis electron-dot diagram of this element in atomic form.
• (a) Mg

(b) •Mg•
16.
The diagram shows the electron-dot diagram of potassium. What does potassium do with electrons to become stable?
1. It gains 1 valence electron.
2. It gains 2 valence electrons.
3. It loses 1 valence electron.
4. It loses 2 valence electrons.
17.
Look at the electron-dot diagram for hydrogen.

An atom of hydrogen would be most likely to bond with an atom of which of the following elements?
18.
How do Lewis diagrams differ from Bohr diagrams?
• Lewis diagram shows the atom's valence electrons and Bohr shows the number of protons and neutrons in the atom's nucleus as well as all of the electrons placed into shells
19.
Four electron-dot diagrams as shown below. Which of these elements is the least likely to bond with another atom?
20.
Which ion's configuration matches that of the noble gas whose electron-dot diagram is below?
1. $"N"^"3-"$
2. $"Rb"^"+"$
3. $"Ca"^"2+"$
4. None of the above
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