storyline 1 exam
which of the following formulas represent an ionic compounds that can be made from these six elements: al, be, f, mg, li, and s?
select all that apply.
□ mgf₂
□ alli
□ bes
□ mg₃al₂

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Accepted Answer

# Brief Explanations:
Ionic compounds are formed between metals and non - metals.
- For $MgF_{2}$: Magnesium ($Mg$) is a metal and fluorine ($F$) is a non - metal. Magnesium forms $Mg^{2 +}$ ions and fluorine forms $F^{-}$ ions. Using the criss - cross method (charge of cation becomes subscript of anion and vice - versa), we get $MgF_{2}$.
- For $BeS$: Beryllium ($Be$) is a metal and sulfur ($S$) is a non - metal. Beryllium forms $Be^{2+}$ ions and sulfur forms $S^{2 -}$ ions. Using the criss - cross method (simplifying the ratio of charges), we get $BeS$.
- For $AlLi$: Both aluminium ($Al$) and lithium ($Li$) are metals. Ionic compounds are formed between metals and non - metals, so $AlLi$ is not an ionic compound.
- For $Mg_{3}Al_{2}$: Both magnesium ($Mg$) and aluminium ($Al$) are metals. Ionic compounds are formed between metals and non - metals, so $Mg_{3}Al_{2}$ is not an ionic compound.

# Answer:
$\text{MgF}_{2}$, $\text{BeS}$

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