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What is a Bonding Pair of Electrons (shared electrons)?
Grade Level:
Class 7
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
A bonding pair of electrons refers to two electrons that are shared between two atoms. These shared electrons hold the atoms together, forming a chemical bond and creating a stable molecule.
Simple Example
Quick Example
Imagine two friends, Rohan and Priya, both want to buy a new cricket bat but each only has half the money. If they pool their money together to buy one bat that they both can use, that bat is 'shared'. Similarly, atoms 'share' electrons to become stable, and these shared electrons are the bonding pair.
Worked Example
Step-by-Step
Let's look at a water molecule (H2O).
1. An Oxygen atom needs 2 more electrons to become stable.
2. Each Hydrogen atom needs 1 more electron to become stable.
3. The Oxygen atom shares 1 electron with the first Hydrogen atom, and that Hydrogen atom shares its 1 electron with Oxygen. This forms one bonding pair.
4. The Oxygen atom then shares another 1 electron with the second Hydrogen atom, and that Hydrogen atom shares its 1 electron with Oxygen. This forms a second bonding pair.
5. In total, the water molecule has two bonding pairs of electrons, holding the Oxygen and two Hydrogen atoms together.
ANSWER: A water molecule has two bonding pairs of electrons.
Why It Matters
Understanding bonding pairs helps us know how molecules are formed, which is crucial in creating new materials for EVs (electric vehicle batteries) and medicines in HealthTech. Scientists and engineers in Biotechnology and Robotics use this knowledge to design everything from new drugs to tiny sensors.
Common Mistakes
MISTAKE: Thinking that bonding pairs are 'given' or 'taken' by atoms. | CORRECTION: Bonding pairs are always 'shared' between atoms, not transferred.
MISTAKE: Confusing bonding pairs with lone pairs. | CORRECTION: Bonding pairs are shared between two atoms, while lone pairs belong to only one atom and are not shared.
MISTAKE: Believing that all atoms need to share the same number of electrons. | CORRECTION: The number of electrons an atom shares depends on how many it needs to achieve a stable electron configuration.
Practice Questions
Try It Yourself
QUESTION: How many bonding pairs of electrons are there in a molecule of hydrogen (H2)? Each hydrogen atom has 1 electron and needs 1 more to be stable. | ANSWER: 1 bonding pair
QUESTION: An atom of chlorine (Cl) needs 1 electron to become stable. If two chlorine atoms form a molecule (Cl2), how many bonding pairs will there be? | ANSWER: 1 bonding pair
QUESTION: Nitrogen (N) needs 3 electrons to become stable. If two nitrogen atoms form a molecule (N2), how many bonding pairs of electrons will be present? Explain your answer. | ANSWER: 3 bonding pairs. Each nitrogen atom shares 3 electrons with the other, forming a triple bond with three shared pairs.
MCQ
Quick Quiz
What is the main role of a bonding pair of electrons?
To make atoms repel each other
To hold two atoms together in a molecule
To transfer electrons from one atom to another
To create a positive charge on an atom
The Correct Answer Is:
B
Bonding pairs of electrons are shared between atoms, and this sharing is what forms the chemical bond, holding the atoms together. They do not cause repulsion, transfer electrons (that's ionic bonding), or create a positive charge.
Real World Connection
In the Real World
In your smartphone, the display screen, battery, and microchips are all made of different materials. The properties of these materials, like how strong they are or how well they conduct electricity, depend on how their atoms are bonded. Understanding bonding pairs helps engineers design these materials to make phones lighter, faster, and more durable, just like how ISRO scientists design materials for rockets.
Key Vocabulary
Key Terms
ATOM: The basic building block of matter | MOLECULE: Two or more atoms held together by chemical bonds | CHEMICAL BOND: A force that holds atoms together in a molecule | ELECTRON: A tiny particle with a negative charge that orbits the nucleus of an atom
What's Next
What to Learn Next
Next, you can learn about 'Lone Pairs of Electrons' and 'Types of Chemical Bonds'. Understanding lone pairs will complete your picture of how electrons are arranged around atoms, and knowing about different bond types will show you various ways atoms connect.
