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Bonds and compounds

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  • How many electrons fit into the first, second, and third electron shells?
    2,8,18
  • What is the difference between a mixture and a chemical change?
    In a chemical change, new substances are formed
  • What is the difference between atomic number and mass number?
    Atomic number = how many protons an element has, mass number = neutrons + protons
  • What is a covalent bond?
    Two non metals share their electrons
  • Describe the bonds find in a water molecule
    One oxygen atom forming two covalent bonds with two oxygen atoms
  • What is a giant covalent structure
    Three dimensional structure of atoms made by covalent bonds
  • What is the difference between cation ana anion?
    Loss of electrons = cation, gaining of electrons = anion
  • What do elements in the same column of a periodic table have in common
    They have the same number of valence electrons
  • Explain the ionic bond
    Bond formed between ions of opposite charges (usually metal and non-metal)
  • Why do atoms form bonds?
    To gain a stable arrangement of electrons
  • Where non-metals located in the periodic table?
    Right side, last-three columns
  • Why do non-metals tend to form covalent bonds?
    They have similiar electronnegativities, neither is strong enough to attract electrons from the other
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