Structure of the Atom

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Across
  1. 2. the central core of the atom
  2. 5. a term used to describe a material that can be pulled out into a long wire
  3. 7. a one or two letter representation of an element
  4. 9. the basic particle from which all elements are made
  5. 10. the sum of protons and neutrons in the nucleus of an atom
  6. 14. the specific amount of energy an electron has
  7. 16. an atom with the same number of protons and a different number of neutrons from other atoms of the same element
  8. 18. an element that lacks most of the properties of a metal
Down
  1. 1. a small particle in the nucleus of the atom
  2. 2. an element in group 18 of the periodic table
  3. 3. elements in the same vertical column of the periodic table
  4. 4. the average mass of all the isotopes of an element
  5. 6. a chart of the elements showing the repeating pattern of their properties
  6. 7. the ability of an object to transfer heat or electricity to another object
  7. 8. the number of protons in the nucleus of an atom
  8. 11. an element in group one of the periodic table
  9. 12. a positively charged particle that is part of an atom's nucleus
  10. 13. a class of elements characterized by physical properties
  11. 15. a negatively charged particle that is found outside the nucleus of an atom
  12. 17. a horizontal row of elements in the periodic table