Page 2: Octet Rule and Ion Formation

This page explores the octet rule and its importance in chemical bonding, along with ion formation processes.

Definition: The octet rule states that atoms tend to gain, lose, or share electrons to achieve eight valence electrons, similar to noble gases.

Highlight: The duet rule is an exception applying to H, Li, and Be atoms, which seek two valence electrons instead of eight.

Example:

• Calcium (Ca) loses two electrons to form Ca²⁺
• Chlorine (Cl) gains one electron to form Cl⁻

Vocabulary:

• Cation: Positively charged ion formed by losing electrons
• Anion: Negatively charged ion formed by gaining electrons

Page 3: Metallic Bonding and Properties

This page details metallic bonding and its unique properties through the sea of electrons model.

Definition: Metallic bonds involve delocalized valence electrons moving freely around fixed positive metal ions.

Highlight: The sea of electrons model explains key metallic properties:

• Lustrous appearance
• Heat conductivity
• Electrical conductivity
• Malleability
• Ductility

Example: Magnesium (Mg) has stronger metallic bonds than sodium (Na) due to more delocalized electrons, resulting in a higher melting point.

Vocabulary:

• Malleability: Ability to be hammered into sheets
• Ductility: Ability to be drawn into wires
• Delocalized electrons: Electrons that are not bound to specific atoms

Page 1: Types of Chemical Bonds

This page introduces the fundamental concepts of chemical bonding, explaining how valence electrons interact between different types of atoms.

Definition: Chemical bonds form when valence electrons of neighboring atoms are transferred, shared, or pooled together.

The page outlines three main types of bonds:

Highlight: The three main types of chemical bonds are:

1. Ionic bonds (metal-nonmetal)
2. Covalent bonds (nonmetal-nonmetal)
3. Metallic bonds (metal-metal)

Example: Table salt (NaCl) demonstrates ionic bonding, water (H₂O) shows covalent bonding, and sodium metal (Na) exhibits metallic bonding.

Vocabulary:

• Formula unit (f.u.): The smallest representative unit of an ionic compound
• Electron sea model: Describes freely moving electrons in metallic bonds