Periodic Table Crossword

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Across
  1. 2. of elements with similar chemical properties.
  2. 4. Ion having a negative charge.
  3. 6. The energy required to remove an electron from a gaseous atom or ion.
  4. 9. Very reactive chemical species which readily lose their one valance electron
  5. 10. The group of elements in which the 4f sublevel is being filled
  6. 13. Having little or no ability to react
  7. 14. Capable of being shaped.
  8. 15. Any of the chemical elements belonging to the s and p blocks.
  9. 16. An ion with net positive charge, having more protons than electrons.
  10. 19. Metallic elements found in the second group of the periodic table.
Down
  1. 1. Reactive nonmetals having seven valence electrons.
  2. 3. The number of protons in the nucleus of an atom.
  3. 5. An element whose properties are intermediate between those of metals and solid nonmetals.
  4. 7. The sum of the masses of its isotopes.
  5. 8. An element that doesn't have the characteristics of metal.
  6. 11. Describing the populations of electronic energy sublevels of an atom
  7. 12. An outer shell electron that is associated with an atom.
  8. 17. given to a horizontal row of the periodic table.
  9. 18. Element Molecule of an element consisting of two atoms.