The Elements

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Across
  1. 2. Salt forming
  2. 3. An organized arrangement of the elements created by Mendeleev
  3. 5. The negative charges in an atom
  4. 6. The ability of a object to transfer heat
  5. 9. The ability of an element to hammered or rolled into other shapes
  6. 10. Elements that have some properties of metals and some properties of nonmetals
  7. 11. A process in which the atomic nuclei of unstable isotopes release particles and energy
  8. 12. The positive charges in an atom
  9. 13. The particle in an atom with no charge
  10. 14. An abbreviation of an elements name using 1 or 2 letters
  11. 16. A molecule made up of 2 atoms
  12. 19. The center of an atom
  13. 20. Substances that can conduct electricity under some but not all conditions
  14. 23. The ability to spontaneously emit radiation
  15. 26. The ease and speed that a substance reacts with other substances
Down
  1. 1. An element that has very few of the properties of a metal
  2. 4. The ability of an object to transfer electric current
  3. 7. Atoms that are the same element but have different numbers of neutrons
  4. 8. The smallest particle of an element
  5. 9. The sum of the protons and neutrons in an atom
  6. 15. A group of elements that conduct electric current and heat well
  7. 17. The gradual wearing away of a metal due to a chemical reaction
  8. 18. The amount of energy an electron has
  9. 21. The ability of a material to be pulled into a long wire
  10. 22. Radioactive isotopes that can be followed through the steps of a chemical reaction
  11. 24. The number of protons in an atom
  12. 25. The average mass of all the isotopes in an element