UNIT 5

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Across
  1. 2. state the level closest to the nucleus is the lowest energy level.
  2. 4. 2 forms of the some element with different masses
  3. 5. of neutrons atomic number minus mass number
  4. 7. Atom with positive charge
  5. 9. neutral particle in the nucleus
  6. 11. energy level the farther away form the nucleus the electron is located
  7. 12. diagram the chemical symbol represented the nucleus and all internal electrons
  8. 14. any solid, liquid or gas
  9. 16. electrons the outermost electron in an atom
  10. 18. ion #p>#E
Down
  1. 1. it’s the first element in the periodic table
  2. 3. rule an atom is most stable when it has 8 valence electrons
  3. 6. number number of protons and neutrons
  4. 8. mass proton+ neutron
  5. 10. charge charge or neutron
  6. 13. cloud. Location of electrons
  7. 15. the neutron is located here
  8. 17. the proton identity’s it