Chemistry

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Across
  1. 3. Positively charges particles in the nucleus
  2. 4. Scientist credited with organizing the modern periodic table by properties of known elements
  3. 6. A pure substance that cannot be separated into a simpler substance by physical means.
  4. 7. Negatively charged particles found in clouds around the nucleus
  5. 10. the last level of an atom.
Down
  1. 1. Particles in the nucleus that have no charge.
  2. 2. Organized chart of the elements found on earth based on their properties, chemical symbol, and classification.
  3. 4. The number of protons
  4. 5. Scientist credited with organizing the modern periodic table by properties of known elements
  5. 8. A pure substance composed of 2 or more elements that are chemically combined.
  6. 9. The nymber of protons and neutrons