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 – 2026
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 atom
Electrons of electrons Electrons 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) possesses 6 valence electrons,
commonly displayed as two lone pairs and two unpaired electrons, allowing it to form two
bonds.
Question 2
Classify the bonding between the given pairs of atoms as ionic, covalent, polar covalent, or
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 – 2026
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 atom
Electrons of electrons Electrons 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) possesses 6 valence electrons,
commonly displayed as two lone pairs and two unpaired electrons, allowing it to form two
bonds.
Question 2
Classify the bonding between the given pairs of atoms as ionic, covalent, polar covalent, or
