Atoms/Isotopes/Ions

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Across
  1. 3. An electron that is found in the outermost shell of an atom
  2. 6. One of the metals that can change their charge
  3. 9. Subatomic particle that has a positive charge and is equal to the atomic number
  4. 10. The sum of the protons and neutrons
  5. 12. A charged atom or molecule
  6. 14. An element in Group 18 on the periodic table
  7. 15. An element that conducts heat and electricity poorly
  8. 17. One of the elements of Group 1 on the periodic table
Down
  1. 1. The law that states that the repeating chemical and physical properties change periodically with the atomic numbers
  2. 2. A subatomic particle that has no charge
  3. 4. Subatomic particle that has a negative charge
  4. 5. One of the elements of Group 17 on the periodic table
  5. 7. The number of protons in the nucleus of an atom
  6. 8. An atom with same number of protons but different number of neutrons
  7. 11. A vertical column of elements in the periodic table
  8. 13. Elements of Group 2 on the periodic table
  9. 16. An element that is shiny and conducts heat and electricity well