CHEM 219
PRINCIPLES OF ORGANIC CHEMISTRY
MODULE 1 EXAM
Portage Learning
Inside you will get:
#### 1. Multiple-Choice Questions
#### 2. True/False Questions
#### 3. Short-Answer Questions
#### 4. Drawings and Mechanism Problems
#### 5. Long-Answer or Essay Questions (Occasional)
#### 6. Expert-Level Rationales (Portage CHEM 219 – 2025 Ready)
, Question 1
On a piece of scratch paper, write out the Lewis Dot Diagram for each of
the indicated elements and then complete the following table for each:
1. Bromine
2. Silicon
3. Carbon
4. Sodium
5. Selenium
*Write number using number (1, 2, 3 etc.) rather than typing out the number
(one, two, three).
Answer
Element Total Number The number The number The number of
of Valence of lone pairs of Unpaired bonds the
Electrons of electrons Electrons atom will form
Br 7 3 1 1
Si 4 0 4 4
C 4 0 4 4
Na 1 0 1 1
Se 6 2 2 2
**Expert Rationale:**
The Lewis Dot Diagram for each atom visualizes their valence electrons based
on their group number in the periodic table. Bromine (Br, Group 17) has 7
valence electrons, typically arranged as three lone pairs and one unpaired
electron, allowing it to form one bond. Silicon (Si, Group 14) and carbon (C,
Group 14) each have 4 valence electrons, all unpaired, signifying the ability to
form 4 bonds. Sodium (Na, Group 1) has one valence electron, which is
unpaired, so it generally forms one ionic bond. Selenium (Se, Group 16)
PRINCIPLES OF ORGANIC CHEMISTRY
MODULE 1 EXAM
Portage Learning
Inside you will get:
#### 1. Multiple-Choice Questions
#### 2. True/False Questions
#### 3. Short-Answer Questions
#### 4. Drawings and Mechanism Problems
#### 5. Long-Answer or Essay Questions (Occasional)
#### 6. Expert-Level Rationales (Portage CHEM 219 – 2025 Ready)
, Question 1
On a piece of scratch paper, write out the Lewis Dot Diagram for each of
the indicated elements and then complete the following table for each:
1. Bromine
2. Silicon
3. Carbon
4. Sodium
5. Selenium
*Write number using number (1, 2, 3 etc.) rather than typing out the number
(one, two, three).
Answer
Element Total Number The number The number The number of
of Valence of lone pairs of Unpaired bonds the
Electrons of electrons Electrons atom will form
Br 7 3 1 1
Si 4 0 4 4
C 4 0 4 4
Na 1 0 1 1
Se 6 2 2 2
**Expert Rationale:**
The Lewis Dot Diagram for each atom visualizes their valence electrons based
on their group number in the periodic table. Bromine (Br, Group 17) has 7
valence electrons, typically arranged as three lone pairs and one unpaired
electron, allowing it to form one bond. Silicon (Si, Group 14) and carbon (C,
Group 14) each have 4 valence electrons, all unpaired, signifying the ability to
form 4 bonds. Sodium (Na, Group 1) has one valence electron, which is
unpaired, so it generally forms one ionic bond. Selenium (Se, Group 16)
