H₂O Two hydrogen atoms, one oxygen atom 3 atoms in total Compounds made from a metal and a non-metal, like sodium chloride, do not form molecules. They form giant structures like this.

Elements bond in fixed ratios and so can be represented by a chemical ... ions and chloride ions, so its formula is NaCl, whereas water is always made from twice the number of hydrogen atoms ...

Wait until a while ring of solid ammonium chloride forms where the hydrogen chloride and ammonia gases meet. The ammonia gas, having a lower molecular weight than the hydrogen chloride, will diffuse ...