Question

when magnesium (mg²⁺) and fluorine (f¹⁻) combine in an ionic bond, the resulting formula will be a mg₂f b mg₂f₂ c mgf d mgf₂

Explanation:

Step1: Identify ion charges

Magnesium: $\text{Mg}^{2+}$ (charge = $+2$); Fluorine: $\text{F}^-$ (charge = $-1$)

Step2: Balance total charge

We need total positive charge = total negative charge. Let number of $\text{F}^-$ ions = $n$. Then:
$$2 + n(-1) = 0 \implies n=2$$

Step3: Write neutral formula

Combine 1 $\text{Mg}^{2+}$ and 2 $\text{F}^-$ to form a neutral compound.

Answer:

D. $\text{MgF}_2$