| Answer | Crossword Clue |
|---|---|
| molecule | the smallest physical unit of an element |
| molecules | MOLECULE, the smallest physical unit of an element |
| MOLECULE | Smallest physical unit of an element |
| molecules | the smallest physical unit of a chemical element or compound |
| atom | the smallest unit of an element having the properties of that element |
| atoms | the smallest unit of an element having the properties of that element |
| ATOM | Smallest unit of an element |
