Part of Atom

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Across
  1. 3. a system for arranging the chemical elements
  2. 5. a particle like an atom that has lost or gained electrons
  3. 7. has a neutral charge
  4. 8. center of an atom
  5. 10. building block of matter
  6. 12. has a negative charge
  7. 13. a pure substance that is made from a single type of atom
  8. 14. represents an element
  9. 16. has a positive charge
Down
  1. 1. a group of atoms that have a full outer shell of electrons
  2. 2. atoms of an element that have the same number of protons and electrons, but a different number of neutrons
  3. 4. the area around an atom's nucleus where electrons are most likely to be found
  4. 6. the total mass of particles of matter in an atom
  5. 9. electrons are located in this area
  6. 11. the number of protons in an atom
  7. 15. the amount of matter in an object