Which of the following metal(s) becomes liquid at a temperature slightly above room temperature?

Both Option 2 and Option 3 are correct

The correct answer is option 4. Both Option 2 and Option 3 are correct.

The explanation is based on the melting points of the mentioned elements:

1. Iron (Fe):  Iron has a high melting point (around 1811 K or 1538°C), which is significantly above room temperature.

2. Gallium (Ga): Gallium is a metal that becomes liquid at a relatively low temperature, just above room temperature. Its melting point is approximately 303 K (30°C or 86°F). This unique property makes gallium interesting for certain applications, such as in some types of temperature-sensitive devices.

3. Cesium (Cs):  Cesium also has a very low melting point. Its melting point is around 301 K (28.5°C or 83.3°F). Like gallium, cesium is a metal that becomes liquid at temperatures slightly above room temperature.

So, the correct answer is that both gallium (Option 2) and cesium (Option 3) become liquid at temperatures slightly above room temperature.