chapter 16 vcaob

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Across
  1. 3. with a positive 1 charge
  2. 5. the elements are arranged by increasing atomic number and by changes in physical and chemical properties
  3. 9. uses the symbol of the element and dots to represent the electrons in the outer energy level
  4. 12. area around the nucleus of an atom where its electrons are most likely found
  5. 13. protons and neutrons are made of even smaller particles called what?
  6. 14. the vertical columns in the periodic table
  7. 15. atoms of the same element that have different numbers of neutrons. (different mass numbers)
Down
  1. 1. particles with a negative 1 charge
  2. 2. the number of protons in the element
  3. 4. the weighted-average mass of the mixture of its isotopes
  4. 6. small positively charged center of the atom. contains the protons and neutrons
  5. 7. the sum of the protons and the neutrons in the element
  6. 8. the horizontal rows in the periodic table
  7. 10. the smallest piece of matter that still retains the properties of the element
  8. 11. neutral particles that have 0 charge