ionic acidity

例句：

1. 1. Ionic compounds are formed when atoms or ions combine to form a stable compound.
   离子化合物是在原子或离子结合形成稳定化合物时形成的。
2. 2. The ionic bond is the strongest type of chemical bond and is found in many minerals.
   离子键是最强的化学键，存在于许多矿物中。
3. 3. In ionic crystals, ions move around freely, allowing for the formation of new compounds.
   在离子晶体中，离子可以自由移动，从而形成新的化合物。