Chemistry

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Across
  1. 4. Atoms of the same element with different numbers of neutrons
  2. 6. The Center part of an atom
  3. 8. Smallest particle of an element that can enter into a chemical reaction
  4. 9. The mass of an object divided by its volume
  5. 11. Early Greek philosopher who proposed indivisible particles called atomos
  6. 15. Neutral particle in nucleus
  7. 16. Anything that has mass and takes up space
  8. 17. The numbers of protons in the nucleus of an atom
  9. 19. The one who Discovered the neutron
  10. 20. The force that holds two atoms together
Down
  1. 1. Proposed that electrons occupy quantized orbits
  2. 2. Negatively charged particle orbiting the nucleus
  3. 3. Group of atoms bonded together
  4. 5. A measurement of matter
  5. 7. A pure substance consisting of one type of atom
  6. 10. Scientist known for uncertainty principle
  7. 12. A charged atom
  8. 13. Connection between atoms
  9. 14. Positively charged particle in the nucleus
  10. 18. Scientist known for the plum pudding model of an atom