Carbon(IV)oxide or more commonly named carbon dioxide (CO2) is a linear molecule of one central carbon atom with two double bonded oxygen atoms.
O = C = O
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C.A molecule that has a symmetrical shape will be a nonpolar molecule.
In potassium oxide, there are 2 potassium atoms for every 1 oxygen atom. The chemical formula for potassium oxide is K2O, so there are 2 potassium atoms in each molecule of potassium oxide.
There are two hydrogen atoms in a molecule of hydrogen oxide, also known as water (H2O).
Since iron oxide is made from TWO elements (Fe, and O), it is a compounds and so you have a MOLECULE, not an atom of iron oxide.
The shape of a DNA Molecule is a Double Helix