Names of binary compounds (compounds made of two elements) end with "-ide".

Here are some examples:

* Sodium chloride (NaCl)

* Magnesium oxide (MgO)

* Hydrogen sulfide (H₂S)

* Calcium bromide (CaBr₂)

However, there are a few exceptions:

* Water (H₂O)

* Ammonia (NH₃)

It's important to note that this rule applies specifically to binary compounds, not to all compounds. For example, compounds with more than two elements, such as sodium bicarbonate (NaHCO₃), do not end in "-ide".