Atomic Structure

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Across
  1. 4. One type of atom
  2. 6. A table of all the elements
  3. 7. Atoms of the same element that have a different number of neutrons
Down
  1. 1. One or two letters that represents an element
  2. 2. The average mass of a typical atom of that element
  3. 3. The number of protons and electrons an atom contains
  4. 5. When two or more atoms combine
  5. 6. A row of elements across the periodic table