The enhanced force of cohesion in metals is due to

Options

A. The covalent linkage between atoms
B. The electrovalent linkages between atoms
C. The lack of exchange of valency electrons
D. The exchange energy of mobile electrons

Answer

To solve the question "The enhanced force of cohesion in metals is due to," we need to analyze the concept of cohesion in metals and the types of bonding involved. Here's a step-by-step solution:

### Step 1: Understand Cohesion
Cohesion refers to the attractive force between like molecules. In the context of metals, it describes how metal atoms are held together.

**Hint:** Think about what it means for similar particles to attract each other.

### Step 2: Identify the Type of Bonding in Metals
In metals, the primary type of bonding is metallic bonding. This involves a lattice of positively charged metal ions surrounded by a sea of delocalized (mobile) electrons.

**Hint:** Consider how the structure of metals differs from that of ionic or covalent compounds.

### Step 3: Role of Mobile Electrons
In metallic bonding, the mobile electrons are not bound to any specific atom. They can move freely throughout the metal lattice, which allows for the exchange of energy between electrons.

**Hint:** Reflect on how the movement of electrons contributes to the overall stability of the metal structure.

### Step 4: Enhanced Cohesion Due to Electron Exchange
The enhanced force of cohesion in metals is attributed to the exchange of energy between these mobile electrons. This exchange creates a strong attractive force that holds the metal atoms together.

**Hint:** Think about how the behavior of electrons in metals differs from that in non-metallic substances.

### Step 5: Evaluate the Options
Given the options:
1. Covalent linkage
2. Electrovalent linkage
3. Lack of exchange of valence electron
4. Exchange energy of mobile electrons

The correct answer is option 4: the exchange energy of mobile electrons.

**Hint:** Consider which option best describes the mechanism behind the cohesion in metals.

### Final Answer
The enhanced force of cohesion in metals is due to the exchange energy of mobile electrons.