Periodic Table Crossword

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Across
  1. 3. an element named after the first person to split an atom after trying to create a new element
  2. 5. the weighted-average mass of the mixture of its isotopes
  3. 7. particles with an electrical charge of 1-
  4. 10. The smallest piece of matter with properties of the element.
  5. 11. any metalic element
  6. 14. the area around the nucleus of an atom
  7. 15. building block of subatomic particles
  8. 16. an element that was named after a country Famous for their bread
  9. 18. an element named after a university in california that discovered over 10 elements
  10. 19. particles with an electrical charge of 1+
  11. 20. A small, positively charged center of an atom.
Down
  1. 1. a chemical element that forms a salt when reacting with metal
  2. 2. the sum of the number of protons and neutrons
  3. 4. Neutral particles without an electrical charge
  4. 6. the number of protons in an atom is equal to this.
  5. 8. an element names after a scientist with the first name Glenn
  6. 9. An element that was initally faked by Victor Ninov
  7. 12. atoms of the same element that have different numbers of neutrons are called this
  8. 13. the sumbol of the element and dots to represent the electrons in the outer energy level
  9. 17. arrangement of elements by increasing atomic number and changes of physical and chemical properties