Question

1. using the periodic table, predict which compound is molecular. (1pts) mgo fes naoh sio₂

Explanation:

Molecular compounds form between nonmetals (or include metalloids with covalent bonding), while ionic compounds form between metals and nonmetals.

1. MgO: Mg (metal) + O (nonmetal) → ionic.
2. FeS: Fe (metal) + S (nonmetal) → ionic.
3. NaOH: Na⁺ (metal cation) + OH⁻ (polyatomic ion) → ionic.
4. SiO₂: Si (metalloid) + O (nonmetal) → covalent/molecular network (classified as molecular in this context).

Answer:

$\boldsymbol{SiO_2}$