Each water molecule is made up of two hydrogen atoms and one _______ atom.

Are you kidding?

A water molecule has 2 hydrogen atoms and one oxygen atom,

Each water molecule is made up of two hydrogen atoms and one "oxy-moronic" atom!

Each water molecule is made up of two hydrogen atoms and one oxygen atom.

To find the missing atom in a water molecule, we can use the chemical formula of water, which is H2O. The formula indicates that each water molecule consists of two hydrogen (H) atoms and one other atom. In this case, the missing atom is oxygen (O).

To get this answer, you can use your knowledge of basic chemistry or do a quick search on the internet using keywords like "chemical formula of water" or "atoms in a water molecule."