Ions and Ionic Bonding

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Ions and Ionic Bonding
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• Lewis-dot structures show valence electrons
  instead of the drawing the whole atom

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Ions

• A charged atom because they have gained or lost
  valence electrons resulting a positively or
  negatively charged atom

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Ionic Bonds

• a type of chemical bond formed between ions with
  opposite charges ( and -)

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It is mostly elements from the left side of the
periodic table combining with those from the
right side
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• Atoms will gain or lose valence electrons in
  order to have a full valence shell (2 or 8)
• ex) Na has one valence electron, therefore it
  would lose it and be 1 charged
  (this is referred to
  as its ionic charge)

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• An oxidation number indicates the charge on the
  atom (or ion) when electrons are lost, gained, or
  shared in chemical bonds
• the oxidation numbers for all the atoms in a
  compound must add up to zero

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• What would the chemical formula for magnesium and
  Nitrogen bonding?
• It takes two nitrogen atoms to combine with
  three magnesium atoms
• Mg3N2
• magnesium nitride

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Naming Ionic Compounds

• there is only one way ions can combine, therefore
  there is only one name for each compound formed
• 1. keep the first elements name the same
• 2. change the second element ending to ide
• ? sodium and chlorine (NaCl) becomes
• sodium chloride
• ? magnesium and fluorine (MgF2).
• magnesium fluoride
• ? K and P (K3P)
• potassium phosphide

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• Easiest way is to switch the charge numbers and
  write them as subscripts on the formula.
• Be 2 and N 3-
• Be3 N2
• beryllium nitride