periodic table

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