Question

which formula represents a covalent compound?
mgs
h₂o₂
cao
nacl

Explanation:

Covalent compounds are formed by the sharing of electrons between non - metal atoms. $MgS$ is an ionic compound formed by a metal ($Mg$) and a non - metal ($S$). $CaO$ is an ionic compound with a metal ($Ca$) and a non - metal ($O$). $NaCl$ is an ionic compound made of a metal ($Na$) and a non - metal ($Cl$). $H_2O_2$ consists of non - metal atoms ($H$ and $O$) which share electrons to form covalent bonds.

Answer:

$H_2O_2$