Periodic table

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Across
  1. 3. Central portion of the atoms with an overall positive charge
  2. 6. A substance with a unique number of protons
  3. 7. Chemical bond where electrons are shared between atoms
  4. 9. Element with a different number of neutrons in the nucleus and is often unstable or radioactive
  5. 11. Number that contains protons plus neutrons
  6. 12. Rows on the periodic table
  7. 15. Most common semiconductor
  8. 17. Positively charged particle in the nucleus
Down
  1. 1. Columns on the periodic table
  2. 2. Electrons that bond with other atoms
  3. 4. Has no metallic properties
  4. 5. Negatively charged particle around the nucleus
  5. 8. Neutral particle in the nucleus
  6. 10. Nonreactive element
  7. 13. Substance that is shiny, malleable, ductile, and conductive
  8. 14. Building block of all matter
  9. 16. Chemical bond where one element gives electrons and another take them