Periodic Table Created by: Angilee Ubiles

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Across
  1. 7. Is needed for humans on earth for survival.
  2. 8. number The number of protons in the nucleus of atom.
  3. 10. An electron that is the highest occupied energy level of an atom.
  4. 12. Helps keep your bones and your teeth strong.
  5. 14. Elements that are poor conductors of heat and electricity.
  6. 15. A substance that is made of two or more elements that are bonded chemically.
  7. 16. symbol Another term for a chemical symbol.
  8. 19. A subatomic particle that has no electric charge.
Down
  1. 1. Pattern of repeating properties.
  2. 2. The periodic table was invented in the year 18.
  3. 3. A positively charged particle in an atom.
  4. 4. Elements 57-71 on the periodic table.
  5. 5. Elements with properties that fall between those of metals and nonmetals.
  6. 6. first artificially made element.
  7. 9. A value that depends on the distribution of an elements isotopes in nature and the masses of those isotopes.
  8. 11. Classified as metals, nonmetals, and metalloids.
  9. 13. A negatively charged particle in an atom.
  10. 17. elements that are good conductors of electric current and heat.
  11. 18. Alkali metals are very reactive with.
  12. 20. Group that contains elements like lithium, sodium, potassium, and rubidium.