Beginner Topic 120 of 1102 Bonding & Molecular Structure
Covalent Bond
A bond formed by sharing electron pairs between two atoms, typically nonmetals.
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In-depth explanation of Covalent Bond
A covalent bond forms when two atoms share one or more pairs of electrons so that each achieves a more stable electron configuration. The shared electron density sits between the two nuclei, where it is attracted to both, and this holds the atoms together. Covalent bonds are directional because orbitals overlap in specific orientations, which gives molecules definite shapes and bond angles. Bonds form most readily between nonmetals with similar electronegativities, and the sharing is equal in homonuclear bonds such as H2 and Cl2. Covalent compounds are typically gases, liquids or soft solids because their molecules attract one another only weakly.
Going deeper: Covalent Bond
Key ideas: Predict a covalent bond between two nonmetals and count shared pairs to satisfy octets: bonds needed equals 8 times the number of atoms needing an octet, minus total valence electrons, then divided by 2. Bond order of 1, 2 or 3 sets length and strength. Covalent bonds are directional, which is what gives molecules their shapes.
Common mistakes and connections: People confuse covalent substances with molecular ones: diamond and quartz are covalent yet form giant networks with very high melting points. Another mistake is assuming sharing is always equal. Connects to bond polarity, valence bond theory, hybridization and intermolecular forces.
Visualization of Covalent Bond
Two hydrogen atoms share one electron pair, giving each a filled 1s shell. The shared density between the nuclei holds the molecule together. The interactive lesson shows this as a live animation or chart.
Worked example and use case
In Cl2 each chlorine atom contributes one electron to the shared pair, giving both atoms a full octet.
Frequently asked questions about Covalent Bond
What is Covalent Bond?
A bond formed by sharing electron pairs between two atoms, typically nonmetals.
Is Covalent Bond a beginner, intermediate or advanced topic?
Covalent Bond is a beginner topic in Bonding & Molecular Structure. It needs no earlier chemistry lessons and is a good starting point.
What should I learn before Covalent Bond?
Study these earlier topics in Bonding & Molecular Structure first: Octet Rule, Duet Rule, Ionic Bond.
What comes after Covalent Bond?
The next topics in Bonding & Molecular Structure are Metallic Bond and Lewis Dot Symbols.
Can I practise Covalent Bond with quizzes?
Yes. The interactive lesson includes a self-check question on Covalent Bond, and the Bonding & Molecular Structure quiz draws on every topic in this area.
Where Covalent Bond fits in Bonding & Molecular Structure
Covalent Bond is topic 5 of 104 in Bonding & Molecular Structure.