chapter 16 vocabulary

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