Atoms

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Across
  1. 3. small, dense, positively charged center of the atoms
  2. 5. an atom or group of atoms with a net electrical charge, either positive or negative
  3. 6. Table a graph of the chemical elements organized by atomic number
  4. 7. Name a temporary name that is based on the atomic number
  5. 9. subatomic particles found inside the nucleus of every atom
  6. 10. the chemical elements have atoms with identical valence electron counts
  7. 12. Symbol a one- or two-letter abbreviation for a chemical element name.
  8. 13. Number # of protons plus the # of neutrons
  9. 15. Building blocks of matter
Down
  1. 1. atoms of the same chemical element that have the same number of protons but a different number of neutrons
  2. 2. Electrons outermost energy level
  3. 4. subatomic particle with a positive electrical charge.
  4. 8. Cloud contains several energy levels
  5. 11. a subatomic particle that is found in all atoms
  6. 14. Number the total number of protons and neutrons in an atom