Intro to Atoms Chapter 3 Lesson 1

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Across
  1. 4. a small particle in the nucleus of the atom with no electrical charge
  2. 6. showed that another particle, the neutron, exists in the nucleus of an atom
  3. 8. smallest particle of an element
  4. 10. the number of protons in the nucleus of an atom
  5. 14. An atom is neutral if the number of protons and __ equal in number
  6. 16. Atomic theory grew and changed as more __ was collected
  7. 18. the space taken up by the __ determine the size of an atom
  8. 19. English scientist thought that atoms were smooth hard balls that could not be broken into smaller pieces
Down
  1. 1. Carbon isotopes have different mass numbers but react the same __
  2. 2. a part of the cell containing DNA and RNA
  3. 3. __ model of the atom consisted of a central nucleus surrounded by electrons moving in specific orbits
  4. 5. a subatomic particle that has a negative charge
  5. 6. scientist that discovered electrons
  6. 7. atoms of the same element that have different numbers of neutrons
  7. 9. a region of the atom in which electrons of the same energy are found
  8. 11. protons and neutrons make up most of the ___ of an atom
  9. 12. The modern atomic theory is based on the __
  10. 13. the sum of the number of neutrons and protons in an atomic nucleus
  11. 15. Gold and Silver are different because of the number of __
  12. 17. a subatomic particle that has a positive charge and is found in the nucleus