Ch. 16 Properties of Atoms and the Periodic Table

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Across
  1. 4. atoms of the same element that have different numbers of neutrons
  2. 5. electrically neutral particles in the nucleus; do not have a charge
  3. 9. area around the nucleus of an atom where electrons are most likely to be found
  4. 12. particles w/ an electric charge of -1; occupy the space surrounding the nucleus of an atom
  5. 13. material that also composes (makes up) parts of protons and neutrons
  6. 14. sum of the number of protons and the number of neutrons in the nucleus of an atom
  7. 15. weighted average mass of all naturally occurring isotopes of an element, measured in amu
Down
  1. 1. elements are arranged by increasing atomic number and by periodic changes in physical and chemical properties
  2. 2. particles in the nucleus w/ an electric charge of +1
  3. 3. dot diagram uses the chemical symbol of an element surrounded by dots to represent the number of electrons in the outermost energy level
  4. 6. small, positively charged center of the atom
  5. 7. smallest particle of an element that retains the element's properties
  6. 8. vertical columns in the periodic table
  7. 10. horizontal rows of elements in the periodic table
  8. 11. number of protons in an atom's nucleus