Periodic Table and Atomic Structure of Matter - Unit 4

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Across
  1. 3. a positive ion
  2. 5. any substance composed of identical molecules that consist of atoms of at least two elements
  3. 8. a negative ion
  4. 9. a group of two or more atoms bonded together
  5. 10. the positively charged subatomic particle
  6. 13. discovered nucleus using alpha particles and gold foil
  7. 15. the name of the force that is felt between two charged particles
  8. 16. rare earth metal that is needed for electric cars
  9. 19. the name of the rare earth metals from atomic number 57-71
  10. 20. a pure substance that cannot be broken down into simpler substances by chemical processes
  11. 23. the negatively charged subatomic particle
  12. 24. the number of groups in the periodic table
  13. 25. where electrons are found in an atom
  14. 26. where the mass of an atom is concentrated
Down
  1. 1. the naturally occurring element with the highest atomic number
  2. 2. the name of the 16th group of elements
  3. 4. the name of the group 17 elements
  4. 6. a substance formed by physically combining two or more different elements or compounds where each component retains its own chemical identity
  5. 7. the subatomic particle with no charge
  6. 8. an element in the fifth period and 15th group
  7. 10. a row in the periodic table
  8. 11. discovered the neutron
  9. 12. a column in the periodic table
  10. 14. the element whose cation form is a single proton
  11. 17. atoms of an element that have different numbers of neutrons
  12. 18. the first person to name the basic building block of matter "atom"
  13. 21. the country with the greatest capacity for mining rare earth metals
  14. 22. the number of rows in the periodic table