The Periodic Table of Elements

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Across
  1. 5. Protons, Neutrons, Electrons
  2. 7. The number of protons in the nucleus of an atom
  3. 9. The negatively charged space containing electrons that surrounds the atomic nucleus
  4. 12. The way something id built or made
  5. 13. Tells you the number of valence electrons in an atom
  6. 14. An energy level representing the distance of an electron from the nucleus of an atom
  7. 16. A positively charged particle in the atomic nucleus
  8. 18. Atomic Mass Unit
  9. 19. The number of electrons in the outermost energy level
  10. 20. A negatively charged particle in the electronic cloud
Down
  1. 1. The amount of matter in an object
  2. 2. The table that shows elements in order of their atomic mass
  3. 3. Average mass of an atom
  4. 4. A pure substance made of only one kind of atom
  5. 6. Smallest unit of an element
  6. 8. Tells you the reactivity, properties, and characteristics of an element
  7. 10. When the sum of positive and negative charges is 0 (zero)
  8. 11. The positively charged center of an atom
  9. 15. A small piece of something
  10. 17. A particle with no electrical charge