Summary of "الروابط الكيميائية Chemical Bonds"

Types of Chemical Bonds

Ionic Bonds
- Formed between a positive ion (cation) and a negative ion (anion) due to electrostatic attraction.
- Example: Sodium chloride (table salt) is formed from sodium (Na) losing an electron and chlorine (Cl) gaining an electron.
- Characteristics of ionic compounds:
  - Soluble in water but not in gasoline.
  - High melting points.
  - Conduct electricity when dissolved in water.
Covalent Bonds
- Formed when nonmetal atoms share electrons.
- Example: Hydrogen molecules (H₂) form by sharing electrons between two hydrogen atoms.
- Types of Covalent Bonds:
  - Single Bond: Sharing of one pair of electrons (e.g., H₂).
  - Double Bond: Sharing of two pairs of electrons (e.g., carbon dioxide, CO₂).
  - Triple Bond: Sharing of three pairs of electrons (e.g., nitrogen, N₂).
- Polar Covalent Bonds occur when there is unequal sharing of electrons due to differences in electronegativity (e.g., H-F).
Hydrogen Bonds
- A type of weak bond that occurs between a hydrogen atom and an electronegative atom (e.g., oxygen, nitrogen, fluorine).
- Important for the properties of water, allowing it to exist in liquid form.
Coordinate Bonds
- Formed when one atom donates both electrons to a bond.
- Example: Ammonium ion (NH₄⁺) is formed when ammonia (NH₃) donates a lone pair of electrons to a hydrogen ion (H⁺).

Ionic Bond Formation:
- Sodium (Na) loses one electron to become Na⁺.
- Chlorine (Cl) gains one electron to become Cl⁻.
- The resulting Na⁺ and Cl⁻ attract each other to form NaCl.
Covalent Bond Formation:
- In H₂, two hydrogen atoms share their single electrons to form a stable bond.
- In water (H₂O), oxygen shares electrons with two hydrogen atoms, resulting in stable molecules.