Across
- 7. Smallest unit of a substance
- 10. Atoms that have gained or lost electrons
- 11. Number of protons on periodic table
- 12. Substance made of one type of atom
- 13. Negatively charged particle
- 14. Energy level in an atom where an electron is
Down
- 1. Number of protons and neutrons on periodic table
- 2. Positively charged particle
- 3. Atoms with same numbers of protons but different numbers of neutrons
- 4. Element that forms positive ions
- 5. Element that forms negative ions
- 6. Substance made of more than one type of atom chemically bonded together
- 8. Substance made of other substances not chemically joined together
- 9. Uncharged particle