What is Electrovalent Bond?

S6-SA4-0018

Grade Level:

Class 10

AI/ML, Physics, Biotechnology, Space Technology, Chemistry, Engineering, Medicine

Definition

What is it?

An electrovalent bond, also known as an ionic bond, is a strong chemical bond formed when one atom completely transfers one or more electrons to another atom. This transfer creates positively charged ions (cations) and negatively charged ions (anions) which are then held together by strong electrostatic forces of attraction.

Simple Example

Quick Example

Imagine you have two friends. One friend has a lot of extra cricket balls, and the other friend has none. The first friend completely gives away a cricket ball to the second friend. Now, the first friend feels 'positive' (happy to share) and the second friend feels 'negative' (has a new ball). They are now connected by this act of sharing, similar to how atoms become connected in an electrovalent bond after giving and taking electrons.

Worked Example

Step-by-Step

Let's see how Sodium Chloride (NaCl), common table salt, forms an electrovalent bond:
1. Sodium (Na) has an atomic number of 11, so its electron configuration is 2, 8, 1. It has 1 valence electron.
---
2. Chlorine (Cl) has an atomic number of 17, so its electron configuration is 2, 8, 7. It has 7 valence electrons.
---
3. Sodium needs to lose 1 electron to achieve a stable octet (2, 8). When it loses an electron, it becomes a positively charged ion, Na+ (2, 8).
---
4. Chlorine needs to gain 1 electron to achieve a stable octet (2, 8, 8). When it gains an electron, it becomes a negatively charged ion, Cl- (2, 8, 8).
---
5. Sodium completely transfers its 1 valence electron to Chlorine.
---
6. The oppositely charged Na+ and Cl- ions are strongly attracted to each other, forming an electrovalent bond.
---
ANSWER: An electrovalent bond is formed between Na and Cl, resulting in NaCl.

Why It Matters

Understanding electrovalent bonds is crucial for chemists designing new medicines and materials, as many salts and minerals are formed this way. In biotechnology, knowing how ions interact helps in understanding cell functions. Engineers use this knowledge to develop strong, heat-resistant materials for various applications.

Common Mistakes

MISTAKE: Thinking electrons are shared in an electrovalent bond. | CORRECTION: In an electrovalent bond, electrons are completely TRANSFERRED, not shared.

MISTAKE: Believing that only one electron can be transferred. | CORRECTION: Atoms can transfer one, two, or even three electrons to achieve stability, like in the formation of MgCl2 (two electrons transferred).

MISTAKE: Confusing ions with neutral atoms. | CORRECTION: Once an atom gains or loses electrons, it becomes a charged particle called an ion (cation if positive, anion if negative), not a neutral atom.

Practice Questions

Try It Yourself

QUESTION: What type of bond is formed between Magnesium (Mg) and Oxygen (O)? | ANSWER: Electrovalent bond

QUESTION: Describe the electron transfer that occurs when Calcium (Ca) and Chlorine (Cl) form a bond. | ANSWER: Calcium (Ca) has 2 valence electrons and will lose both to become Ca2+. Each Chlorine (Cl) atom has 7 valence electrons and will gain 1 electron to become Cl-. Therefore, one Ca atom will transfer 1 electron to each of two Cl atoms to form CaCl2.

QUESTION: An element X has an atomic number of 12 and element Y has an atomic number of 9. Explain the formation of the bond between X and Y. | ANSWER: Element X is Magnesium (Mg) (2, 8, 2) and will lose 2 electrons to form Mg2+. Element Y is Fluorine (F) (2, 7) and will gain 1 electron to form F-. Therefore, one X atom will transfer 1 electron to each of two Y atoms, forming an electrovalent bond in XY2.

MCQ

Quick Quiz

Which of the following describes an electrovalent bond?

Sharing of electrons between two atoms

Complete transfer of electrons from one atom to another

Attraction between two positively charged ions

Attraction between two negatively charged ions

The Correct Answer Is:

An electrovalent bond involves the complete transfer of electrons, leading to the formation of oppositely charged ions that attract each other. Sharing of electrons describes a covalent bond.

Real World Connection

In the Real World

Many common substances we use daily, like table salt (sodium chloride), are held together by electrovalent bonds. These bonds are why salt crystals are hard and have high melting points. In medicine, many antacids contain compounds like magnesium hydroxide, which are also formed through electrovalent bonding, helping to neutralize stomach acid.

Key Vocabulary

Key Terms

ION: A charged atom or molecule formed by gaining or losing electrons | CATION: A positively charged ion | ANION: A negatively charged ion | VALENCE ELECTRON: Electrons in the outermost shell of an atom, involved in bonding | OCTET RULE: Tendency of atoms to prefer to have eight electrons in their valence shell

What's Next

What to Learn Next

Great job understanding electrovalent bonds! Next, you should explore 'What is a Covalent Bond?'. This will help you compare and contrast the two major types of chemical bonds and see how atoms can also achieve stability by sharing electrons, which is another fascinating way they connect.