Periodic Table Groups and Common Oxidation States

Main group elements are organized into eight distinct A-groups: Group $1A$ , Group $2A$ , Group $3A$ , Group $4A$ , Group $5A$ , Group $6A$ , Group $7A$ , and Group $8A$ .
Transition elements occupy the central block of the periodic table, serving as a transition bridge between the left and right sides of the main group elements.
Group $3A$ corresponds to Group $13$ on the periodic table, whereas Group $3B$ designates a transition metal group.

Group $1A$ (Alkali Metals):
- Nomenclature: Alkali metals.
- Common oxidation state: $+1$ .
Group $2A$ (Alkaline):
- Nomenclature: Alkaline.
- Common oxidation state: $+2$ .
Group $3A$ (Boron Family):
- Nomenclature: Boron family.
- Common oxidation state: $+3$ .
Group $4A$ (Carbon Family):
- Nomenclature: Carbon family, named specifically after carbon because it is the first element listed in the group.
- Common oxidation states: $+4$ or $-4$ .
- Variable state rule: The positive oxidation state ( $+4$ ) applies to metallic elements within the group, whereas the negative oxidation state ( $-4$ ) applies to nonmetals.
Group $5A$ (Nitrogen Family / Nucleogens):
- Nomenclature: Nitrogen family or nucleogens (spelled with a silent "p").
- Common oxidation states: $+5$ or $-3$ .
- Variable state rule: Metallic elements in Group $5A$ predominantly exhibit positive oxidation states ( $+5$ ), whereas nonmetallic elements exhibit negative oxidation states ( $-3$ ).
Group $6A$ (Oxygen Family / Charcotchins):
- Nomenclature: Oxygen group, oxygen family, or Charcotchins.
- Common oxidation state: Only $-2$ .
Group $7A$ (Halogens):
- Nomenclature: Fluorine family or halogens.
- Common oxidation state: $-1$ .

Moving left-to-right across the periodic table demonstrates a systematic progression from metals to nonmetals.
Oxidation state preferences directly reflect this metallic-to-nonmetallic progression:
- Metals on the far left favor positive oxidation states.
- Intermediate groups composed of both metals and nonmetals display both positive and negative oxidation states.
- Extreme nonmetals on the right (such as Group $6A$ / Charcotchins) exclusively display negative oxidation states.

Group $8A$ (Noble Gases / Mobile Glasses):
- Nomenclature: Noble gases, also referred to as mobile glasses because they are completely unreactive and do not react with anything.
Fundamental Chemical Motivation: All elements gain, lose, or share electrons to exhibit their specific oxidation states solely to achieve the stable electronic configuration of noble gases.
Future Academic Scope: Detailed electronic configurations and the underlying structural reasons for positive and negative oxidation states relative to noble gases will be covered in subsequent classes.

Student Inquiry on Oxidation States:
- A student inquired about the definition of an oxidation state and what a state of $+1$ signifies.
- Clarification provided: Detailed theoretical definitions will follow in later chapters; students must memorize the group names and common oxidation states for immediate reference.
Note-Taking Directives:
- Reassurance given to Russell regarding note-taking in class, confirming that course materials will be sent on time.
Student Guesses and Corrections:
- During the discussion of Group $5A$ , a student conjectured an oxidation state of $-5$ , which was corrected to $+5$ and $-3$ .
- During the discussion of Group $7A$ , a student incorrectly guessed a positive oxidation state for halogens, which was corrected to $-1$ .

Blackboard Review:
- Students are required to review all information and study materials posted on Black board for Chapter 1 and Chapter 2.
Alec's Homework:
- Alec's homework covering Chapter 2 is due within one week, serving as test preparation practice.
Syllabus Quiz Requirement:
- Three students (Jenny, Nick, and Roxy) have not yet completed the syllabus quiz.
- Completion of the syllabus quiz is required immediately because graded assessment records are mandated by September 1.