Ions are formed when atoms - lose or gain electrons, Sodium has one electron in its outer shell - which it loses to become stable, Stability means the atom has - a full outer shell, Chlorine needs one more electron - to make its outer shell full, When an ionic bond forms - there is a transfer of electrons, Electrons move from an atom with too many - to one that doesn't have enough, Two ions have opposite charges - so are attracted to each other, Ionic bonds are - really strong, In a dot and cross diagram we use  - dots and crosses to represent electrons, An atom like magnesium has to lose - two electrons to become stable, Magnesium can give an electron to each - of two chlorine atoms to make magnesium chloride, The formula for magnesium chloride is - MgCl2,

Ionic bonds

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