Periodic Table Created by: Angilee Ubiles

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