Across
- 3. – The smallest particle of an element that retains its properties.
- 4. – A chemical link between two atoms.
- 7. – A negatively charged particle that orbits the nucleus.
- 8. – The lightest element in the periodic table.
- 10. – A substance with a pH less than 7.
Down
- 1. – A substance with a pH more than 7.
- 2. – Two or more atoms chemically bonded together.
- 5. – A gas essential for breathing.
- 6. – Anything that has mass and takes up space.
- 9. – What happens when substances chemically change.