1. Charge Neutrality:
* Ionic compounds are formed by the electrostatic attraction between positively charged ions (cations) and negatively charged ions (anions).
* The key is that these charges balance each other out. The number of positive charges exactly equals the number of negative charges, resulting in a neutral compound overall.
2. Example:
* Take table salt (NaCl). Sodium (Na) loses an electron to become Na+ (cation), while chlorine (Cl) gains an electron to become Cl- (anion).
* The charges perfectly balance: one +1 charge from Na+ and one -1 charge from Cl-.
3. Formula Units:
* Ionic compounds aren't represented by individual molecules like covalent compounds. They exist as repeating, three-dimensional structures called formula units. These formula units always maintain the charge balance.
4. Electrolytes:
* While overall neutral, ionic compounds can become charged when dissolved in water. This is because the water molecules can separate the ions, leading to a solution that conducts electricity (an electrolyte).
In summary: Ionic compounds achieve neutrality because they are formed by a precise balance of positive and negative charges. This balance is maintained in the formula units that make up the compound.
