Which of the following metals is the most ductile metal?
Gold
Understanding Ductility in Metals
The question asks us to identify the most ductile metal among the given options: Copper, Tin, Aluminium, and Gold. Ductility is a physical property of a material that describes its ability to be stretched or drawn into thin wires without breaking. This property is a measure of a metal's tolerance to plastic deformation under tensile stress.
Analyzing the Ductility of Options
Let's look at the ductility of each metal listed:
- Copper: Copper is a very ductile metal. It is widely used in electrical wiring because it can be easily drawn into thin wires.
- Tin: Tin is a soft and malleable metal, but it is less ductile compared to copper or gold. It can be drawn into wire, but not as finely as others.
- Aluminium: Aluminium is also a ductile metal and is used for making wires, although it is typically less conductive than copper. Its ductility is significant.
- Gold: Gold is renowned for its exceptional ductility and malleability. It is considered the most ductile metal known. A single gram of gold can be drawn into a wire 2.4 kilometers (about 1.5 miles) long.
Comparing Ductility
While Copper and Aluminium are ductile, Gold surpasses them significantly in this property. Tin is considerably less ductile than the other three. The order of ductility among these metals, from most to least ductile, is generally accepted as Gold > Copper > Aluminium > Tin.
| Metal | Ductility | Notes |
|---|---|---|
| Gold | Extremely High | Most ductile metal; can be drawn into very fine wires. |
| Copper | High | Excellent for electrical wiring due to high ductility. |
| Aluminium | High | Used for wires; good ductility but generally less than copper. |
| Tin | Moderate | Soft and malleable, but less ductile than Gold, Copper, or Aluminium. |
Conclusion: Identifying the Most Ductile Metal
Based on the properties of these metals, Gold is widely recognized as having the highest ductility. It can be stretched into thinner wires than Copper, Tin, or Aluminium without fracturing.
Therefore, among the given options, Gold is the most ductile metal.
Revision Table: Metal Properties
| Property | Definition | Example (Most Ductile Metal) |
|---|---|---|
| Ductility | Ability to be drawn into thin wires under tensile stress. | Gold |
| Malleability | Ability to be hammered or pressed into thin sheets without breaking. | Gold (also very malleable) |
| Hardness | Resistance to scratching, abrasion, or indentation. | (Varies greatly among metals) |
| Conductivity | Ability to conduct heat or electricity. | Copper (high electrical conductivity) |
Additional Information on Metal Properties
Ductility and malleability are often confused but are distinct properties. Malleability is the ability to be flattened into sheets under compressive stress, while ductility is the ability to be drawn into wires under tensile stress. Gold is exceptional because it is both the most ductile and one of the most malleable metals.
Other metals are also known for their ductility, such as platinum, silver, and iron, but when compared to Gold, their ductility is generally lower. The ductility of a metal can also be affected by temperature and impurities.
Important Questions from Structure of Atom
Identify the element having zero valency
What is the atomic number of nitrogen?
What are isobars?
Which of the following metals is the most reactive element?
What kind of forces arise from transient dipoles in atoms that induce transient dipoles in nearby atoms, produce an attractive force and are significant only over short distances (~500 pm)?
