What are the types of chemical bonding?
Chemical bonding is how atoms combine to form molecules and compounds. There are three main types—ionic, covalent, and metallic bonding—each with distinct properties and behavior.
The three main types are ionic bonding (electron transfer between atoms), covalent bonding (electron sharing between atoms), and metallic bonding (delocalized electrons in a metal lattice).
- •Electron transfer
- •Forms ions (cations & anions)
- •High melting point
- •Conducts in solution
- •Electron sharing
- •Forms molecules
- •Lower melting point
- •Often non-conducting
Step-by-step worked examples
NaCl (table salt) forms when sodium donates an electron to chlorine. What type of bonding is this?
Sodium (metal) loses one electron → Na⁺ ion Chlorine (nonmetal) gains one electron → Cl⁻ ion Opposite charges attract → Ionic bonding
In H₂O, two hydrogen atoms and one oxygen atom share electrons. What type of bonding?
H and O both share electron pairs No electron transfer occurs Bonds form from shared electron clouds → Covalent bonding
In solid copper, metal atoms release electrons into a shared 'electron sea'. What type of bonding?
Cu atoms donate valence electrons Electrons move freely throughout the lattice Delocalized electrons hold atoms together → Metallic bonding
Flashcards
Quick quiz
Q1.Which type of bonding involves electron transfer?
Q2.H₂ (hydrogen gas) uses which bonding type?
Q3.Ionic compounds typically have high melting points because…
Q4.What is the 'electron sea' in metallic bonding?
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Common mistakes
Assuming only ionic bonds occur between metals and nonmetals. — Correct: Metals can form covalent bonds with nonmetals (e.g., CO in carbon monoxide).
Thinking metallic bonding only occurs in pure metals. — Correct: Metallic bonding occurs in alloys too (mixtures of metals).
Confusing covalent and ionic bonding as opposites with no overlap. — Correct: Many bonds are polar covalent—intermediate between purely covalent and ionic.
Assuming all nonmetals form only covalent bonds. — Correct: Nonmetals can form ionic bonds (e.g., N³⁻ in nitrides).
FAQ
How do you identify ionic vs. covalent bonding?
Ionic: metal + nonmetal, high melting point, conducts when melted. Covalent: nonmetal + nonmetal, low melting point, often insoluble in water.
What is a polar covalent bond?
Covalent bond where electrons are shared unequally, creating partial charges (δ+ and δ−) on the atoms.
Why do ionic compounds dissolve in water?
Water's polar molecules surround and stabilize ions, pulling them apart (hydration).
Can carbon form different types of bonds?
Yes. Carbon forms covalent bonds with nonmetals (CO₂), metallic bonds in graphene, and coordinate covalent bonds.