Properties of Elements

12345678
Across
  1. 4. The number of protons in an atom.
  2. 5. The average mass of all the atoms of an element.
  3. 8. Special features of a substance, like color or hardness.
Down
  1. 1. The one- or two-letter code for an element.
  2. 2. A pure substance made of only one kind of atom.
  3. 3. A column down the periodic table.
  4. 6. The smallest building block of matter.
  5. 7. Elements that are shiny and good at conducting heat and electricity.
  6. 8. A row across the periodic table.