Atoms and the Periodic Table

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Across
  1. 2. a vertical column on the periodic table containing elements of similar properties
  2. 5. elements in the last group of the Periodic Table that are known to be nonreactive and stable
  3. 7. the smallest particle of an element that cannot be broken down without further changing the element's properties
  4. 8. a substance made up of only one kind of atom
  5. 10. elements that lack the properties of metals, being dull and/or brittle
  6. 11. elements that are usually solid, with a shiny surface, ductile and malleable
  7. 12. a horizontal row on the periodic table containing elements with the same number of energy levels
  8. 13. the number of protons in an atom
Down
  1. 1. a group of two or more atoms
  2. 3. an electron found in the highest energy level of an atom
  3. 4. negatively charged particle found in the space outside the nucleus of an atom
  4. 6. elements that have properties of both metals and nonmetals or inbetween
  5. 9. the average mass of all the protons and neutrons in the atom
  6. 10. particle found inside the nucleus of an atom that do not have a charge
  7. 12. positively charged particle found inside the nucleus of an atom