Which of the following metals is a liquid at room temperature?
Understanding Metals and Their States
Most metals are known for being solid at room temperature. They are typically hard, shiny, and good conductors of heat and electricity. However, there are exceptions to this general rule.
The question asks which specific metal among the given options is a liquid at room temperature. Room temperature is generally considered to be around 20-25 degrees Celsius ($20-25^\circ\text{C}$). Let's look at the properties of the metals listed in the options:
- Sodium (Na): Sodium is an alkali metal. It is a soft, silvery-white solid at room temperature. It has a relatively low melting point for a metal ($97.8^\circ\text{C}$), but it is still well above room temperature.
- Calcium (Ca): Calcium is an alkaline earth metal. It is a soft, silvery-white solid at room temperature. It has a melting point of $842^\circ\text{C}$, which is much higher than room temperature.
- Mercury (Hg): Mercury is a unique metal. Unlike most other metals, it is a liquid at room temperature and standard pressure. Its melting point is $-38.83^\circ\text{C}$, which is significantly below room temperature. This property makes mercury useful in applications like thermometers and barometers.
- Lithium (Li): Lithium is an alkali metal, the lightest solid metal. It is a soft, silvery-white solid at room temperature. Its melting point is $180.54^\circ\text{C}$, which is also well above room temperature.
Comparing the melting points of these metals to room temperature ($20-25^\circ\text{C}$), we can see that Mercury is the only one whose melting point is below this range.
Analysis of Options:
- Sodium is a solid at room temperature.
- Calcium is a solid at room temperature.
- Mercury is a liquid at room temperature.
- Lithium is a solid at room temperature.
Therefore, based on the physical state of these metals at room temperature, Mercury is the correct answer.
| Metal | Symbol | Melting Point ($\circ\text{C}$) | State at Room Temperature (approx. $25^\circ\text{C}$) |
|---|---|---|---|
| Sodium | Na | $97.8$ | Solid |
| Calcium | Ca | $842$ | Solid |
| Mercury | Hg | $-38.83$ | Liquid |
| Lithium | Li | $180.54$ | Solid |
This table clearly shows that Mercury's melting point is below typical room temperature, making it a liquid, while the others are solids.
Revision Table: Properties of Metals
| Property | Typical Metals | Exception (Mercury) |
|---|---|---|
| Physical State at Room Temperature | Solid | Liquid |
| Melting Point | Generally High | Very Low |
| Appearance | Usually Shiny (Lustrous) | Silvery Liquid |
Additional Information: Metals Liquid at Room Temperature
While Mercury is the most well-known metal that is a liquid at room temperature, there are a few others that melt just above room temperature, often considered liquid in slightly warmer conditions or as alloys. Examples include:
- Gallium (Ga): Melts at $29.76^\circ\text{C}$, which is slightly above standard room temperature but can melt from body heat.
- Cesium (Cs): Melts at $28.4^\circ\text{C}$, also just above standard room temperature.
- Francium (Fr): Estimated melting point is around $27^\circ\text{C}$, but it is extremely rare and radioactive.
However, among the commonly encountered and stable metals, Mercury is the definitive liquid at typical room temperature conditions.
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