Question

which of the following is a covalent molecule? select all that apply a h₂o b nacl c o₂ d mgcl

Explanation:

Covalent molecules form by sharing electrons. Water ($H_2O$) has oxygen and hydrogen sharing electrons. Oxygen gas ($O_2$) has two oxygen atoms sharing electrons. Sodium chloride ($NaCl$) and magnesium chloride ($MgCl$) are ionic compounds formed by transfer of electrons between metal and non - metal atoms.

Answer:

A. $H_2O$, C. $O_2$