Structure of an Atom

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Across
  1. 5. AMU
  2. 8. charge on the proton
  3. 9. charge on the neutron
  4. 11. proposed the existence of energy
  5. 12. made of electrons, neutrons, and protons
  6. 13. groups of atoms
  7. 14. atoms with the same number of protons but different mass and neutron numbers
  8. 16. groups of two or more elements that are bonded together
  9. 19. building blocks for all matter
Down
  1. 1. number representing the number of protons in the nucleus of an atom
  2. 2. 1- 3 letter notation used to represent an atom corresponding to a particular element
  3. 3. Cloud group of electrons that form an electron cloud
  4. 4. charge on the electron
  5. 6. neutral particle within the nucleus of an atom
  6. 7. columns on periodic table
  7. 8. positively charged particle in an atom
  8. 10. Table big grid where elements are placed according to the way they work and act
  9. 15. center of an atom
  10. 17. rows in periodic table
  11. 18. or electron orbits