Chemistry Vocab (Lesson 3)

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Across
  1. 4. The total average number of protons and neutrons in an atom.
  2. 7. A system of organization for the elements.
  3. 8. One of the three broad categories into which elements are classified that contains hydrogen, the halogen gases, and the noble gases.
  4. 9. a variation of an element based on the number of neutrons in its nucleus.
Down
  1. 1. the letter or abbreviation of an element
  2. 2. The name for a column in the Periodic Table of Elements.
  3. 3. The number of protons contained in an atom.
  4. 5. One of the three broad categories into which elements are classified that contains boron and sulphur; also called semimetals or semi conductors.
  5. 6. The name for a row in the Periodic Table of Elements.