Ionic bonding

• Ions


  Ions are charged particles formed between

  metals and non-metals
• Ionic bonding


  It involves the transfer of electrons.

  Opposites attract. So the negative ions are

  strongly attracted to the positive ions (and vice

  versa)
• Forming cations


  It requires less

  energy to lose one

  electron than gain 7

  electrons.

  The ion is left with

  1 more proton than

  electron so becomes

  positively charged

  by +1.
• Forming anions


  The ion has one more

  electron than proton so

  becomes negatively

  charged by -1.
• What is ionic bonding?

  Ionic bonding is the electrostatic attraction between positively

  charged metals and negatively charged non metals.
• WRITING IONIC FORMULA

  When ions react together, the charges must

  cancel out

  If the charges match (+1 and -1, or +2 and -2),

  only one of each ion is needed

  E.g. Na+ and Cl- forms NaCl

  E.g. Mg2+ and O2- forms MgO

  If charges don’t match, you must work out how

  many of each ion is needed to cancel out the

  charge

  E.g. Mg2+ and Cl- forms MgCl2

  E.g. Na+ and O2- forms Na2O