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Periodic Trends and Diagonal Relationships quiz

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Terms in this set (15)

  • What is a diagonal relationship in the periodic table?
    A diagonal relationship is a similarity between a period 2 element and another element that is one period down and one group to the right, resulting in similar chemical properties.
  • Which elements exhibit a diagonal relationship with lithium, beryllium, and boron?
    Lithium with magnesium, beryllium with aluminum, and boron with silicon.
  • How do lithium and magnesium react with nitrogen, and what compounds do they form?
    Both react with elemental nitrogen (N2) to form nitrides: lithium forms Li3N and magnesium forms Mg3N2.
  • What is the charge on the nitride ion, and how does it affect the formula of lithium nitride?
    The nitride ion has a -3 charge, so lithium nitride is Li3N to balance the charges.
  • What happens to the hydroxides and carbonates of lithium and magnesium upon heating?
    Both undergo thermal decomposition to form their respective metal oxides and carbon dioxide gas.
  • How do beryllium and aluminum behave differently from other elements in their groups when reacting with water?
    They form oxide coatings that prevent further reaction with water, unlike other group members that react to release hydrogen.
  • What type of oxides do beryllium and aluminum form, and what does amphoteric mean?
    They form amphoteric oxides, which can behave as either acids or bases.
  • How do boron and silicon behave electrically, and what term describes this behavior?
    They behave as semiconductors, meaning they have properties between those of conductors (metals) and insulators (nonmetals).
  • What is an oxyacid (or oxoacid), and how does it differ from a binary acid?
    An oxyacid contains hydrogen, a nonmetal or metalloid, and oxygen, while a binary acid contains only hydrogen and a nonmetal without oxygen.
  • Name the weak acids formed by boron and silicon in their oxoacid forms.
    Boron forms boric acid, and silicon forms silicic acid.
  • What are the covalent hydrides of boron and silicon, and what is their significance?
    Boron forms borane (BH3) and silicon forms silane; both are strong reducing agents and important in organic chemistry.
  • What are some physical properties of borane and silane?
    They are very flammable and have low melting points.
  • Why are diagonal relationships important in understanding periodic trends?
    They show that elements in different groups can have similar chemical properties due to their positions on the periodic table.
  • How do you identify a diagonal relationship on the periodic table?
    Move down one period and to the right one group from a period 2 element to find its diagonal counterpart.
  • List three sets of elements that exhibit diagonal relationships.
    Lithium and magnesium, beryllium and aluminum, boron and silicon.