elements

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Across
  1. 3. The smallest particle that has the properties of an element
  2. 5. any atoms having the same number of protons but a different number of neutrons
  3. 7. a vertical column of elements in the periodic table
  4. 9. number the total number of protons and neutrons in the nucleus of an atom
Down
  1. 1. a horizontal row of elements in the periodic table
  2. 2. another name for group
  3. 3. number the number of protons in the nucleus of an atom
  4. 4. hundred eighteen elements The number of elements on the periodic table
  5. 6. another name for period
  6. 8. symbol for atomic mass unit