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Covalent Bonding

Covalent bonding is the chemical bonding formed when atoms share one or more pairs of electrons.

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Student-friendly explanation

Covalent bonds commonly form between non-metal atoms. Instead of transferring electrons completely, atoms share electron pairs so that each atom gets a more stable outer-shell arrangement.

How to write this in exams

  1. 1

    Start with the exact idea

    Covalent bonding is the chemical bonding formed when atoms share one or more pairs of electrons.

  2. 2

    Then show how to use it

    Count valence electrons. Find how many electrons each atom needs. Share the required number of electron pairs. Check that outer shells are complete for school-level examples.

  3. 3

    Add one concrete example

    In a chlorine molecule, two chlorine atoms share one pair of electrons, so each chlorine atom completes its outer shell.

  4. 4

    Avoid this incomplete answer

    Writing that electrons are fully transferred in Cl2 is wrong because both atoms are non-metals and share electrons.

Definition

Covalent bonding is the chemical bonding formed when atoms share one or more pairs of electrons.

Example

In a chlorine molecule, two chlorine atoms share one pair of electrons, so each chlorine atom completes its outer shell.

Rule to remember

Covalent bond: sharing of electron pair(s), usually between non-metal atoms.

Memory hook

Covalent means common sharing.

Examples and method

Worked example

Oxygen has six valence electrons and needs two more. Two oxygen atoms share two pairs of electrons to form O2 with a double covalent bond.

Method to apply

Count valence electrons. Find how many electrons each atom needs. Share the required number of electron pairs. Check that outer shells are complete for school-level examples.

Diagram support

Draw electron-dot diagrams with shared pair(s) between atoms, such as Cl-Cl or H-O-H.

How CBSE asks it

Asked as electron-dot structures, comparison with ionic bonding, or explaining low conductivity of covalent compounds.

Avoid common mistakes

Common confusion

Students sometimes call every bond with non-metals weak. Covalent bonds within molecules can be strong, but forces between small molecules are often weak.

Common wrong answer

Writing that electrons are fully transferred in Cl2 is wrong because both atoms are non-metals and share electrons.

Exam tip

For covalent bonding answers, mention sharing of electron pairs and show shared electrons clearly in dot diagrams.

Quick check

Why do two chlorine atoms form a Cl2 molecule by sharing electrons?

Each chlorine atom has seven valence electrons and needs one more for a stable outer shell. By sharing one pair of electrons, both chlorine atoms complete their outer shells.

Study the covalent bonding diagram carefully

Use the labelled diagram to keep covalent bonding clear in short answers and revision.

What this diagram makes clear

This diagram keeps the labels and direction of covalent bonding in the right order.

Where this helps in exams

Use this for labelled diagram work and short exam answers on covalent bonding.

Revision cue

Revise covalent bonding through the labels before writing the answer.

Answer writing and exam use

1-mark answer

Covalent bonding is the chemical bonding formed when atoms share one or more pairs of electrons.

2-mark answer

Covalent bonding is the chemical bonding formed when atoms share one or more pairs of electrons. Covalent bond: sharing of electron pair(s), usually between non-metal atoms. In a chlorine molecule, two chlorine atoms share one pair of electrons, so each chlorine atom completes its outer shell.

3-mark answer

Covalent bonds commonly form between non-metal atoms. Instead of transferring electrons completely, atoms share electron pairs so that each atom gets a more stable outer-shell arrangement. Covalent bond: sharing of electron pair(s), usually between non-metal atoms. Oxygen has six valence electrons and needs two more. Two oxygen atoms share two pairs of electrons to form O2 with a double covalent bond. Asked as electron-dot structures, comparison with ionic bonding, or explaining low conductivity of covalent compounds. Writing that electrons are fully transferred in Cl2 is wrong because both atoms are non-metals and share electrons.
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