What are the types of chemical bonds?

 Chemical bonds hold atoms together to form molecules and compounds. The three primary types of strong bonds are ionic, covalent, and metallic, while hydrogen bonds and London dispersion forces act as weaker, temporary connections. [1, 2]

1. Primary (Strong) Bonds

• Ionic Bonds: Formed when electrons are completely transferred from one atom to another, creating positive and negative ions that attract each other.
  • Mechanism: Electrostatic attraction.
  • Example: Sodium chloride (table salt), where \(Na^{+}\) and \(Cl^{-}\) attract. [1, 2, 3]
• Covalent Bonds: Formed when atoms share pairs of electrons to achieve stability. These can be nonpolar (electrons shared equally) or polar (electrons shared unequally).
  • Mechanism: Shared electron orbits.
  • Example: Water (\(H_{2}O\)), carbon dioxide (\(CO_{2}\)). [1, 2, 3, 4]
• Metallic Bonds: Occur between metal atoms where electrons are free to move across a lattice structure in a "sea of electrons".
  • Mechanism: Delocalized electrons.
  • Example: Pure metals like copper, iron, or gold. [1, 2, 3, 4]

2. Secondary (Weak) Bonds

• Hydrogen Bonds: Weak electrostatic attractions occurring when a hydrogen atom covalently bound to a highly electronegative atom is attracted to another electronegative atom.
  • Example: Bonds between water molecules. [1, 2]
• Van der Waals Forces / London Dispersion: Weak, temporary attractions caused by shifting electron densities in atoms or molecules.