Elements and Compounds

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