Question

2/50
which of the following is not an ionic compound:
br₂
naoh
cao
bacl₂

Explanation:

Ionic compounds form between metals and nonmetals (or polyatomic ions) via electrostatic attraction of charged ions.

• $\text{BaCl}_2$: Barium (metal) + chlorine (nonmetal) = ionic.
• $\text{CaO}$: Calcium (metal) + oxygen (nonmetal) = ionic.
• $\text{NaOH}$: Sodium (metal) + hydroxide (polyatomic ion) = ionic.
• $\text{Br}_2$: Two bromine (nonmetal) atoms form a covalent molecular substance, no ions present.

Answer:

$\text{Br}_2$