Periodic Table Crossword Puzzle

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Across
  1. 3. a horizontal row in the periodic table.
  2. 5. the number of protons contained in each nucleus of its atoms of the element.
  3. 7. a chart that organizes information about all of the known elements according to their atomic number.
  4. 8. an element or substance that conducts heat and electricity, is malleable and ductile and has low ionization energy and low electronegativity values.
  5. 10. a substance that cannot be broken down into a simpler substance by ordinary chemical means.
  6. 11. an atom that has gained or lost one or more electrons.
Down
  1. 1. a vertical column on the periodic table.
  2. 2. describes how likely an element is to form bonds with other elements.
  3. 4. electrons that are located in the outermost energy level of an atom.
  4. 6. the number of protons and neutrons in the nucleus of one atom of the element.
  5. 9. the smallest unit of an element that has all of the properties of the element.