Question

Which of the following elements has the highest electrical conductivity among all metals?

• A. Copper
• B. Gold
• C. Aluminum
• D. Silver

Hint:

Remember the conductivity order: Silver \(>\) Copper \(>\) Gold \(>\) Aluminum Although Silver is the best conductor, Copper is most commonly used for electrical wiring because it is much cheaper and still highly conductive.

Answer 1

The Correct Option is D

Concept: Electrical conductivity is the ability of a material to allow the flow of electric current through it. In metallic substances, electrical conduction occurs because of the movement of free electrons present within the metallic lattice. The greater the ease with which electrons can move through a material, the higher its electrical conductivity. Among all naturally occurring metals, one metal possesses the highest electrical conductivity and serves as the standard against which other conductors are compared.

Step 1: Understanding electrical conductivity in metals. Metals contain a large number of free electrons that are not tightly bound to individual atoms. When a potential difference is applied:

• These electrons begin to move.

• Electric current flows through the material.

• Resistance to electron flow determines conductivity.
A metal with lower resistance exhibits higher electrical conductivity.

Step 2: Examining Silver (Ag). Silver possesses the highest electrical conductivity among all metals. Its exceptional conductivity is due to:

• High electron mobility.

• Favorable crystal structure.

• Very low electrical resistivity.
The electrical conductivity of silver exceeds that of copper, gold, and aluminum. For this reason: \[ \boxed{\text{Silver is the best electrical conductor among metals.}} \]

Step 3: Analyzing Copper (Option A). Copper is the second-best conductor among commonly used metals. It is extensively used in:

• Household wiring.

• Electric motors.

• Transformers.

• Power distribution systems.
Although copper is highly conductive, its conductivity is slightly lower than that of silver. Therefore, Option (A) is incorrect.

Step 4: Analyzing Gold (Option B). Gold has excellent conductivity and remarkable resistance to corrosion. Because it does not tarnish easily, it is used in:

• Electronic connectors.

• Computer chips.

• Precision instruments.
However, its conductivity is lower than both silver and copper. Therefore, Option (B) is incorrect.

Step 5: Analyzing Aluminum (Option C). Aluminum is a good conductor of electricity and is widely used in overhead transmission lines because it is:

• Lightweight.

• Economical.

• Relatively conductive.
However, its conductivity is significantly lower than silver. Therefore, Option (C) is incorrect.

Step 6: Comparing the conductivity ranking. The general conductivity order among the given metals is: \[ \boxed{\text{Silver} > \text{Copper} > \text{Gold} > \text{Aluminum}} \] This confirms that silver occupies the first position.

Step 7: Final conclusion. Among all metals, the element with the highest electrical conductivity is: \[ \boxed{\text{Silver (Ag)}} \] Therefore, the correct answer is: \[ \boxed{\text{(D) Silver}} \]