Question

what is the chemical formula for the ionic compound calcium chloride? a ca₂cl b cacl₂ c cl₂ca d clca₂

Explanation:

Step1: Identify ion charges

Calcium (Ca) forms $\text{Ca}^{2+}$; chloride (Cl) forms $\text{Cl}^-$

Step2: Balance charge neutrality

Need 2 $\text{Cl}^-$ to balance 1 $\text{Ca}^{2+}$ (total charge: $+2 + 2(-1) = 0$)

Step3: Write formula (cation first)

Cation is written first, followed by anion with subscript for count.

Answer:

B. $\text{CaCl}_2$