Across
- 1. - Center of the atom.
- 4. - Two or more atoms chemically bonded.
- 6. - Table that organizes all known elements.
- 9. - Positively charged particle.
- 10. - Pure substance made of one type of atom.
Down
- 2. - Substance made of two or more elements.
- 3. - Neutral particle inside the nucleus.
- 5. - Negatively charged particle.
- 7. - Positively or negatively charged particle.
- 8. - Smallest unit of an element.