Here's why:
* Sodium (Na) is a Group 1 element, meaning it typically forms a +1 charge in ionic compounds.
* Sulfur (S) is a Group 16 element and commonly forms a -2 charge in ionic compounds.
To balance the charges and form a stable compound, you would need two sodium atoms for every one sulfur atom. The correct formula for this compound is Na₂S, which is called sodium sulfide.
Let me know if you have other chemical formulas you'd like help with!
