Chemistry: History of the Periodic Table

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LaurenCamp29
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245241
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Chemistry: History of the Periodic Table
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2014-06-14 15:51:55
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chemistry chem history periodic table marking period jun
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  1. How did Mendeleev arrange the periodic table?
    By atomic mass
  2. What was the problem with Mendeleev's arrangement of elements?
    • Too many gaps
    • Different Isotopes
  3. How did Mosley improve on Mendeleev's table?
    Arranged elements by increasing atomic #
  4. What does periodic mean?
    Having repeated cycles
  5. What happens to an atoms atomic # or mass as you go left to right?
    It increases
  6. Why are there 7 periods in the periodic table?
    There are 7 energy levels
  7. Where are the metals located on the periodic table?
    • Anywhere left of the staircase
    • *except Hydrogen
  8. Where are the non-metals located on the periodic table?
    Right of the staircase
  9. Where are the metalloids located on the periodic table?
    • Anything touching the staircase
    • *Except Aluminum
  10. What is Aluminum?
    A metal
  11. Why does the periodic table now go by atomic number and not atomic mass?
    Atomic mass can change
  12. 4 characteristics of Metals?
    • Malleable¬†
    • Lustrous
    • Ductile
    • Good conductor of heat and electricity
  13. Can bend
    Malleable
  14. Is shiney
    Lustrous
  15. Able to form wires
    Ductile
  16. 2 characteristics of Non-Metals
    • Gases at room temperature
    • Poor conductors of heat/electricity
  17. Poor conductors of heat/electricity
    Insulator
  18. Why do we refer to some families as subshells?
    Because of their shapes
  19. 3 characteristics of Metalloids
    • Dull
    • Brittle
    • Semi-conductors
  20. Why are alkaline metals so reactive?
    It's easy to lose electrons
  21. Most P block elements are...
    Non-metals
  22. To love electrons/want to gain an electron
    Electron affinity
  23. S and P block elements are called
    Main group elements
  24. When halogens react to water what do they form?
    Anion
  25. What are the most of the D block elements called?
    Transitional
  26. Mixture of 2 metals
    Alloy
  27. Why are halogens so reactive?
    They have 7 electrons in their outer shell
  28. What makes Noble Gases so important in Chemistry?
    • They don't react
    • All elements want to be like them
  29. Characteristics of a cation?
    • Metal
    • Positive charge
  30. Characteristics of an anion?
    • Non-metals
    • Negative Charge
  31. What is similar between cations and anions?
    Both have charges
  32. Electrons in the last shell
    Valence Electrons
  33. Most reactive family of nonmetals?
    Halogens
  34. Most reactive metal?
    Francium
  35. Why is Francium the most reactive metals?
    It takes very little energy to lose an electron
  36. Why is the Atomic Radius smaller going up?
    Fewer energy levels
  37. Why is the Atomic Radius smaller to the right?
    Increased nuclear charge pulls electrons in tighter
  38. Size of the atom
    Atomic Radius
  39. Energy required to lose an electron
    Ionization Energy

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