The Atomic Structure

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Across
  1. 2. ~ the mass of a single atom
  2. 4. ~ a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
  3. 5. ~ a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
  4. 8. ~ closely packed together and contain the least amount of kinetic energy.
  5. 11. ~ Danish physicist who made foundational contributions to understanding atomic structure and quantum theory, for which he received the Nobel Prize in Physics in 1922.
  6. 12. ~ table of chemical elements
  7. 15. ~ a Russian chemist and inventor. He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements.
  8. 19. ~ a part or aspect of something abstract, especially one that is essential or characteristic.
Down
  1. 1. ~ The weight of a substance
  2. 3. ~ the number of protons found in the nucleus of every atom of that element.
  3. 6. ~ no definite shape (takes the shape of its container)
  4. 7. ~ two or more atoms chemically joined together
  5. 9. ~ subatomic particle with a positive electric charge
  6. 10. ~ atoms move freely
  7. 13. ~ the basic unit of a chemical element.
  8. 14. ~ its mass per unit volume
  9. 16. ~ the small, dense region consisting of protons and neutrons at the center of an atom
  10. 17. ~ subatomic particle with a negative electric charge
  11. 18. ~ the area around an atom's nucleus where electrons are most likely to be found