FORMING COMPOUNDS

• FORMING COMPOUNDS:

  Compounds form when atoms collide and their valence electrons interact to form stable octets.
• Ionic Compounds:

  Form when a metal and a non-metal come

  together
• Ionic Compounds:

  atoms may lose electrons (metals) OR gain

  electrons (non-metals)
• Ionic Compounds:

  electrons are transferred from one atom

  to another to form stable ions
• Ionic Compounds:

  an ionic compound is made up of a

  positive ion (cation) and a negative

  ion (anion)
• Ionic Compounds:

  The attraction between the oppositely charged ions is called an

  ionic bond.
• Ionic Compounds:

  ionic compounds are neutral
• The attraction between the ions is strong, giving ionic compounds the following physical properties:

  relatively high melting points
• The attraction between the ions is strong, giving ionic compounds the following physical properties:

  form electrolytes - meaning they conduct

  electricity when molten or dissolved in

  water, but not in the solid state
• The attraction between the ions is strong, giving ionic compounds the following physical properties:

  odourless (ex/ table salt)
• Molecular Compounds (Covalent):

  atoms in molecular compounds share

  pairs of electrons
• Molecular Compounds (Covalent):

  the atoms may share 1, 2 or 3 pairs of

  electrons
• Molecular Compounds (Covalent):

  the attraction between the atoms sharing

  electrons is called a covalent bond
• Molecular Compounds (Covalent):

  forms between two non-metals.
• Molecular Compounds (Covalent):

  If the two atoms in a molecular compound

  are the same, it is called a diatomic

  molecule.
• The bonds between the atoms of the molecule are strong BUT the forces between each of the molecules is weak

  giving molecular compounds the following physical properties:

  low melting points
• The bonds between the atoms of the molecule are strong BUT the forces between each of the molecules is weak

  giving molecular compounds the following physical properties:

  not electrolytes - they do not conduct electricity as a solid or a liquid because they do not contain ions
• The bonds between the atoms of the molecule are strong BUT the forces between each of the molecules is weakgiving molecular compounds the following physical properties:

  have an odour (ex/ mothballs)