Sam's Crossword

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