Elements & The Periodic Table

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Across
  1. 2. the positively charged particle
  2. 4. group 17 elements
  3. 6. the metals in group 1
  4. 7. atoms of the same element that have different number of neutrons
  5. 9. the ease and speed with which a substance reacts with other substances
  6. 12. particle with no electrical charge
  7. 13. he noticed that a pattern of properties appeared when elements were arranged in order of increasing atomic mass
  8. 15. these have properties of metals but also properties of nonmetals
  9. 17. the _______ number is the number of protons in the nucleus of an atom
  10. 18. the negatively charged particle
  11. 19. the horizontal rows of the periodic table
  12. 20. the center of an atom
  13. 22. the largest group of elements on the periodic table
Down
  1. 1. when a material can be pulled out or drawn into a long wire
  2. 3. when a material can be hammered or rolled into flat sheets or other shapes
  3. 5. elements with atomic numbers higher than 92 are sometimes called _______ elements
  4. 8. the vertical columns of the periodic table
  5. 10. can easily transmit electricity
  6. 11. the gradual wearing away of a metal due to a chemical reaction
  7. 14. group 2 of the periodic table are the _______ earth metals
  8. 16. the ______ number is the sum of the protons and neutrons
  9. 21. the ability to reflect light