The Periodic table

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Across
  1. 5. mass the average mass of all the isotopes of that element
  2. 6. the sum of the protons and neutrons on the atom
  3. 8. atoms with the same number of protons and different numbers of neutrons are called
  4. 10. a chart showing all of the elements arranged according to the repeating pattern of their properties.
Down
  1. 1. the element phosphorus on the periodic table
  2. 2. dense center
  3. 3. Mendeleev Discovered a set of patterns that applies to all the elements
  4. 4. the smallest particle that can still be considered an element
  5. 7. number the number of protons in the nucleus of an atom is the
  6. 9. Rutherford called a positively charged particle in an atoms nucleus