| Answer | Crossword Clue |
|---|---|
| OZONE | It's made of three oxygen atoms |
| trioxides | An oxide containing three atoms of oxygen in its molecule or empirical formula |
| sesquioxide | an oxide with three atoms of oxygen to two of the other constituent |
| sesquioxides | SESQUIOXIDE, an oxide with three atoms of oxygen to two of the other constituent |
| trioxide | oxide containing three oxygen atoms, as As2O3 |
| triatomic | having three atoms in the molecule ozone is triatomic oxygen |
