periodic table

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Across
  1. 2. a vertical column of elements in the periodic table
  2. 4. number the total number of protons and neutrons in the nucleus of an atom
  3. 6. an ion with a negative charge
  4. 10. the number of protons in the nucleus of an atom
  5. 11. group 1 or 1A
  6. 14. a negatively charged subatomic particle found in the energy level of an atom
Down
  1. 1. isotopes any atoms having the same number of protons but a different number of neutrons
  2. 3. another name for group
  3. 5. an ion with a positive charge
  4. 7. the elements that are usually poor conductors of heat and electricity
  5. 8. an element that has properties of both a metal and nonmetal
  6. 9. the elements that are good conductors of heat and electricity
  7. 12. the process of adding electrons to or removing electrons from an atom or group of atoms
  8. 13. another name for period