elements

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