Question

select two of the following compounds that are covalent.
a. cacl₂
b. p₂o₅
c. fe₂s₃
d. mgf₂

Explanation:

Covalent compounds are formed by sharing of electrons between non - metals. In $CaCl_2$, $Ca$ is a metal and $Cl$ is a non - metal, it forms an ionic compound. In $P_2O_5$, both $P$ (phosphorus) and $O$ (oxygen) are non - metals and share electrons to form covalent bonds. In $Fe_2S_3$, $Fe$ is a metal and $S$ is a non - metal, it is ionic. In $MgF_2$, $Mg$ is a metal and $F$ is a non - metal, it is ionic.

Answer:

B. $P_2O_5$