Here's why:
* Ionic Bonding: KBr is an ionic compound, formed by the electrostatic attraction between positively charged potassium ions (K+) and negatively charged bromide ions (Br-). These strong ionic bonds hold the ions in a rigid, crystalline lattice structure.
* High Melting Point: The strong ionic bonds require a lot of energy to break. This high energy requirement translates to a high melting point. The melting point of KBr is 734°C (1353°F), which is significantly higher than room temperature.
Therefore, KBr is a solid at room temperature due to its strong ionic bonds and high melting point.
