Question

which of the following is the correct formula for cesium sulfide?
a. css
b. cs₂s₂
c. cs₂s
d. css₂

Explanation:

Cesium (Cs) is in Group 1 of the periodic - table and has a + 1 charge ($Cs^+$). Sulfur (S) is in Group 16 and has a - 2 charge ($S^{2 - }$). To form a neutral compound, two cesium ions are needed to balance the charge of one sulfide ion. So the formula is $Cs_2S$.

Answer:

C. $Cs_2S$