The periodic table

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Across
  1. 2. The smallest part of an element is the ________.
  2. 3. The element with the most energy in the periodic table is ________.
  3. 7. K is the symbol for ________.
  4. 8. ________ has an average mass of 1.01.
  5. 10. ________ has an average mass of 226.
  6. 11. Oxygen is in the ________ group.
  7. 12. Protons have a ________ charge.
  8. 13. The charge of a neutron is ________.
  9. 14. Cl is the symbol for ________
Down
  1. 1. Boron is a ________.
  2. 4. There are ________ groups in the periodic table.
  3. 5. Silver`s atomic number is ________.
  4. 6. ________ has an atomic number of fifteen.
  5. 9. Electrons have a ________ charge.