The correct answer is option 1. Bromine.
Bromine is a halogen element and the only non-metal that exists in liquid form at room temperature and pressure. At standard room temperature (around 25°C or 77°F), bromine exists as a reddish-brown liquid.
The reason for bromine's liquid state at room temperature is its relatively low melting and boiling points compared to other non-metals. Bromine has a melting point of -7.2°C (19°F) and a boiling point of 58.8°C (137.8°F). These temperatures are within the range commonly encountered in room conditions.
Unlike other non-metals such as chlorine, phosphorus, and iodine, which are typically gases (at room temperature and pressure) or solids, bromine atoms are held together by weak van der Waals forces, allowing them to move around and maintain a liquid state at room temperature.
Bromine's liquid form makes it useful in various applications. It is used as a reagent in organic synthesis, as a flame retardant in materials, and in the production of certain pharmaceuticals and chemicals. However, due to its corrosive and toxic nature, bromine should be handled with caution. |
