Atoms and the Periodic Table

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Across
  1. 2. the average mass of the element’s isotopes
  2. 7. a neutral particle that exists in the nucleus of an atom
  3. 9. anything that has mass and takes up space
  4. 10. tool that lists elements according to their atomic number and properties
  5. 11. small positively charged area in the center of an atom
  6. 12. the smallest piece of an element
  7. 13. an atomic particle that has one positive charge
  8. 14. a vertical column on the periodic table (up and down)
  9. 15. the number of protons in an atom of an element
Down
  1. 1. sum of the number of protons and neutrons in an atom
  2. 3. outermost electrons of the electron shell
  3. 4. amu; a small unit used to measure atoms
  4. 5. an area around an atomic nucleus where an electron is most likely to be located
  5. 6. six types of particles that make up neutrons and protons
  6. 8. a particle with one negative charge (-)
  7. 13. a horizontal row on the periodic table (going across)