Science course

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Across
  1. 4. A row of elements across the periodic table
  2. 5. The element containing 111 neutrons
  3. 7. When two or more atoms combine, they form ...
  4. 9. Atomic mass - atomic number = number of ...
  5. 10. The atomic "..." tells you the average mass of a typical atom of that element
Down
  1. 1. The element with 22 protons
  2. 2. A column of elements in the periodic table
  3. 3. The atomic "..." tells you how many protons an atom contains
  4. 6. Has a trunk and is big
  5. 8. Center of every atom