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What is a Coordinate Bond (dative bonding)?
Grade Level:
Class 6
Space Technology, EVs, Climate Change, Biotechnology, HealthTech, Robotics, Chemistry, Physics
Definition
What is it?
A coordinate bond, also called a dative bond, is a special type of covalent bond where one atom donates both of the shared electrons to form the bond. Think of it like a friend lending you both their cricket bat and ball to play together, instead of each of you bringing one item.
Simple Example
Quick Example
Imagine you and your friend are sharing a plate of samosas. In a normal sharing (covalent bond), you both bring one samosa each to share. But in a coordinate bond, one friend brings both samosas, and you both share them. The sharing still happens, but the contribution comes from only one side.
Worked Example
Step-by-Step
Let's understand how a coordinate bond can form between ammonia (NH3) and a hydrogen ion (H+).
Step 1: Ammonia (NH3) has a nitrogen atom with one 'lone pair' of electrons (two electrons not involved in bonding). Think of this as two extra samosas Nitrogen has.
---Step 2: A hydrogen ion (H+) is a hydrogen atom that has lost its only electron. It's like a friend who has no samosas and is looking for some.
---Step 3: The nitrogen atom in ammonia 'donates' its lone pair of electrons to the hydrogen ion. This forms a shared pair, creating a bond.
---Step 4: Now, both the nitrogen and hydrogen share these two electrons. The hydrogen ion gets its electron shell filled, and the nitrogen still has a stable octet.
---Answer: This bond, where nitrogen provided both electrons for sharing, is a coordinate bond, forming an ammonium ion (NH4+).
Why It Matters
Understanding coordinate bonds is crucial for creating new medicines in HealthTech and Biotechnology, as these bonds are key in how molecules interact. They are also important in Chemistry for designing new materials and catalysts used in industries and even in developing better batteries for EVs.
Common Mistakes
MISTAKE: Thinking a coordinate bond is completely different from a covalent bond. | CORRECTION: A coordinate bond IS a type of covalent bond, just with a specific way the shared electrons are contributed (both from one atom).
MISTAKE: Believing that after forming a coordinate bond, the donating atom loses the electrons permanently. | CORRECTION: The electrons are still SHARED between the two atoms, not transferred. The donating atom still 'owns' them but shares them more closely.
MISTAKE: Confusing coordinate bonds with ionic bonds, where electrons are fully transferred. | CORRECTION: In coordinate bonds, electrons are shared, not transferred. In ionic bonds, one atom completely gives electrons and another completely takes them.
Practice Questions
Try It Yourself
QUESTION: If atom A has an extra pair of electrons and atom B needs two electrons to be stable, and they form a bond where A provides both electrons, what type of bond is it? | ANSWER: Coordinate bond (or dative bond)
QUESTION: Explain the difference in electron contribution between a normal covalent bond and a coordinate bond. | ANSWER: In a normal covalent bond, each atom contributes one electron to the shared pair. In a coordinate bond, one atom contributes both electrons to the shared pair.
QUESTION: Imagine a group of friends sharing snacks. If Rohan brings 3 packets of chips and shares them with Priya, who brought nothing, is this like a coordinate bond or a normal covalent bond? Why? | ANSWER: This is like a coordinate bond because Rohan (one person) is providing all the items (chips) for sharing, similar to how one atom provides both electrons for the bond.
MCQ
Quick Quiz
Which statement best describes a coordinate bond?
Electrons are completely transferred from one atom to another.
Each participating atom contributes one electron to form a shared pair.
One atom contributes both electrons to form a shared pair.
Atoms share protons instead of electrons.
The Correct Answer Is:
C
Option C correctly defines a coordinate bond where one atom donates both electrons for sharing. Options A describes an ionic bond, and B describes a normal covalent bond. Option D is incorrect as bonds involve electrons, not protons.
Real World Connection
In the Real World
Coordinate bonds are super important in how many medicines work! For example, some drugs used to treat heavy metal poisoning form coordinate bonds with the metal ions, trapping them so they can be removed from the body. This is a crucial part of HealthTech, helping people recover from serious illnesses.
Key Vocabulary
Key Terms
LONE PAIR: A pair of electrons in an atom that are not involved in bonding | COVALENT BOND: A chemical bond formed by the sharing of electrons between atoms | DATIVE BOND: Another name for a coordinate bond | DONOR ATOM: The atom that provides both electrons for the shared pair in a coordinate bond
What's Next
What to Learn Next
Great job learning about coordinate bonds! Next, you can explore 'Types of Covalent Bonds' to understand more about single, double, and triple bonds. This will build on your understanding of sharing electrons and help you see how different molecules are formed.
