Runnymede Chemistry Review

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Across
  1. 3. _____ metals include sodium and rubidium
  2. 4. gas that makes a "Pop!" when tested with a flame
  3. 6. an atom with a positive or negative charge
  4. 7. the number of electrons the first orbit can hold
  5. 10. uncharged part of the nucleus
  6. 11. pure substance made of one kind of atom
  7. 13. element found in the upper right corner of the periodic table
  8. 14. type of compound formed by a metal and a nonmetal
  9. 16. smallest unit of an element
  10. 17. pure substance made of more than one kind of atom
  11. 20. a type of bond where electrons are shared
  12. 21. Niels _____ proposed that electrons existed in discreet orbits
  13. 22. a row in the table of the elements
  14. 24. mixture of metals
  15. 25. John _____ proposed the billiard ball model of the atom
  16. 27. element that tends to form positive ions
  17. 29. _____ number is the sum of protons and neutrons in an atom
  18. 30. include chlorine and fluorine
Down
  1. 1. alkaline _____ metals include calcium and beryllium
  2. 2. the number of electrons the second orbit can hold
  3. 3. a negative ion
  4. 5. Ernest _____ discovered the nucleus
  5. 8. _____ gases hardly react chemically at all
  6. 9. negatively charged atom bit
  7. 12. two or more atoms chemically joined together
  8. 15. a positive ion
  9. 18. Dmitri _____, father of the periodic table
  10. 19. positive atom bit
  11. 23. elements in a chemical _____ have similar properties
  12. 26. the atomic _____ tells you the number of protons
  13. 28. JJ _____ proposed the plum pudding model of the atom