Chapter 4 Vocab

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Across
  1. 2. a standard unit of mass equal to one-twelfth the mass of a carbon-12 atom
  2. 5. all matter is made of indivisible atoms, atoms of the same element are identical, atoms of different elements are different, and atoms combine in fixed ratios to form compounds
  3. 7. a positively charged particle found in the center, or nucleus, of every atom
  4. 9. a standard unit of mass equal to one-twelfth the mass of a carbon-12 atom
  5. 10. arrangement of elements in which the elements are separated into groups based on the set of repeating properties
  6. 11. each horizontal row of the periodic table
  7. 12. the total number of protons and neutrons in an atom
  8. 14. negatively charged atomic particles
  9. 15. the number of protons in the nucleus of an atom of that element
Down
  1. 1. a weighted average mass of the atoms in a naturally occuring sample of the element
  2. 3. the basic building block of all matter
  3. 4. atoms that have the same number of protons but different numbers of neutrons
  4. 6. each verticle column of the periodic table
  5. 8. a tiny central core of an atom and is composed of neutrons and protons
  6. 13. subtamic particles with no charge but with a mass nearly equal to a proton