What is hybridization?
Hybridization is the mixing of atomic orbitals (s, p, d) to create new hybrid orbitals that have different shapes and energies. This concept explains bonding and molecular geometry.
Hybridization combines pure atomic orbitals into hybrid orbitals (sp, sp², sp³, dsp³, d²sp³) oriented toward specific bond angles and molecular shapes, improving bonding overlap.
- 1↓Pure s orbitalSpherical electron cloud
- 2↓+ p orbitalsDumbbell-shaped electron clouds
- 3↓Mix (hybridize)Orbitals blend into new shapes
- 4Hybrid orbitalssp, sp², sp³ oriented for bonding
Step-by-step worked examples
Carbon in methane (CH₄) forms 4 equivalent C-H bonds at 109.5° angles. What is the hybridization?
Carbon has 1 s orbital and 3 p orbitals All 4 orbitals mix to form 4 sp³ hybrids Each hybrid points to a H atom at 109.5° (tetrahedral)
Ethene (C₂H₄) has each carbon forming a double bond with the other and 2 single bonds to hydrogens, with 120° angles. What hybridization?
Each carbon uses 1 s orbital and 2 p orbitals 3 orbitals mix to form 3 sp² hybrids The remaining p orbital forms the π bond Triple geometry with 120° angles
Carbon in acetylene (HC≡CH) forms a triple bond using 1 s and 1 p orbital, with 180° angle. What is the hybridization?
Each carbon uses 1 s orbital and 1 p orbital 2 orbitals mix to form 2 sp hybrids Two remaining p orbitals form two π bonds Linear geometry with 180° angle
Flashcards
Quick quiz
Q1.Boron in BF₃ forms 3 equivalent B-F bonds at 120° angles. What is the hybridization?
Q2.How many hybrid orbitals are formed in sp³ hybridization?
Q3.In acetylene (HC≡CH), each carbon uses sp hybridization. What bond angle?
Q4.Why do hybrid orbitals form better bonds than pure orbitals?
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Common mistakes
Confusing hybridization with resonance structures. — Correct: Hybridization describes orbital mixing; resonance describes electron delocalization.
Thinking hybridization predicts all bonding properties. — Correct: Hybridization explains σ bonding geometry; π bonds use unhybridized p orbitals.
Assuming d orbitals are used in sp³ hybridization. — Correct: sp³ uses only s and p orbitals; dsp³ includes d orbitals.
Not recognizing that hybridization follows geometry. — Correct: Determine electron domains first, then hybridization follows naturally.
FAQ
What is the relationship between hybridization and VSEPR geometry?
VSEPR predicts geometry from electron domain repulsion; hybridization explains how orbitals orient to achieve that geometry.
Can a single atom use multiple hybridization types?
No. A single atom hybridizes in one way (sp, sp², or sp³), but different atoms in a molecule can use different hybridizations.
What is the difference between σ and π bonds in hybridization?
σ bonds form from hybrid orbitals overlapping head-on; π bonds form from unhybridized p orbitals overlapping side-by-side.
Why doesn't nitrogen in NH₃ use sp² if it has 3 H atoms?
Nitrogen has 4 electron domains (3 bonding + 1 lone pair), so it uses sp³ hybridization.