Bonding Types
Chapter 1 of The Blueprint of Water describes how atoms form bonds to reach lower-energy, filled valence shells, and it groups the bonding types that matter for water chemistry. The chapter covers ionic and covalent bonds (nonpolar and polar), plus the weaker hydrogen bonds that link water molecules into a network.
| Bond type | Mechanism | Example | Relative strength | Behavior in water |
|---|---|---|---|---|
| Ionic bond | One atom transfers valence electrons to another, forming a cation and anion held by electrostatic attraction | Sodium chloride (Na⁺ Cl⁻), calcium carbonate lattice (Ca²⁺ with CO₃²⁻) | Strong (crystal lattices are stable and hard to pull apart) | Exposed charges are a target. Water surrounds and stabilizes the individual ions, dissolving the lattice |
| Nonpolar covalent bond | Identical atoms share electrons equally because their electronegativities match | O₂ (double bond, two shared pairs) | Strong (about ten times a hydrogen bond) | Symmetric pull, no charge separation, so little direct attraction to water |
| Polar covalent bond | Different atoms share electrons unevenly, the more electronegative atom pulls them closer, creating partial charges | CO₂ (polar bonds, linear so molecule is nonpolar), O H bonds in H₂O | Strong (a true chemical bond) | Partial charges let molecules interact with water in special ways, though molecular polarity also depends on geometry |
| Hydrogen bond | Positive (hydrogen) end of one water molecule attracts the negative (oxygen) end of another; a persistent intermolecular attraction, not a true chemical bond | Water to water, up to four per molecule (about 3.4 on average at room temperature) | Weak individually, roughly one tenth of a covalent bond | Builds the constantly breaking and reforming hydrogen-bond network that lets water move heat, dissolve minerals, and carry passengers |
Related concepts
Valence electrons · Octet Rule · Electronegativity · Crystal lattice · Hydrogen-Bond Network · Lone pairs of electrons
Part of The Blueprint of Water