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Atoms and Bonding

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  • What is one advantage of using an alloy instead of a pure metal?
    stronger, resists corrosion, not as bendable
  • When an atom loses an electron, it becomes ___.
    an ion
  • A metal consists of positive metal ions in a "sea" of ___.
    electrons
  • The attraction between a positive metal ion and the electrons surrounding it is ___.
    a metallic bond
  • Give one property of an ionic compound.
    crystal structure, conducts heat and electricity, high boiling point
  • The electrons involved in bonding are ___ electrons.
    valence
  • A covalent bond in which electrons are shared unequally is ___.
    a polar bond
  • How do we draw a bond between two atoms?
    two dots (electrons) or a dash line
  • Give a reason for why water and oil don't mix.
    Water is polar and oil is nonpolar
  • What is the chemical name for the compound Na2S?
    Sodium sulfide
  • How does a covalent bond hold two atoms together?
    The nucleus of the atom is positive and the electrons of the other atom is negative, they attract to each other
  • When electrons are transferred between two atoms, a ___ bond is formed.
    Ionic
  • How many electrons make an atom "happy"?
    8
  • In the chemical formula for hydrogen peroxide (H2O2) what do the 2's mean?
    There are 2 hydrogen atoms and 2 oxygen atoms in it
  • When an atom gains an electron, it becomes ___.
    Negative
  • Which of these is a property of ionic compounds?
    low melting point
    brittle
    cannot conduct electricity
    low boiling point
  • Stainless steel and bronze are examples of ___.
    an alloy
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