1. Determine the Charges:
* Calcium (Ca) is in group 2 of the periodic table, meaning it typically loses two electrons to form a +2 cation (Ca²⁺).
* Sulfur (S) is in group 16, meaning it typically gains two electrons to form a -2 anion (S²⁻).
2. Balance the Charges:
* Since the charges are already equal and opposite (+2 and -2), we need one calcium ion for every one sulfur ion to achieve a neutral compound.
3. Write the Formula:
The ionic bond formula for calcium and sulfur is CaS.
