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\newpage  \section{EL7}  \subsection{Formation of Ions and Electrostatic Bonds}  Positively charged ions are called cations, and anions are negatively charged ions (PANIC - Positive anode, negative is cathode).  \begin{itemize}  \item Group 1 elements form +1 ions  \item Group 2 elements form +2 ions  \item Group 6 elements form -2 ions  \item Group 7 elements form -1 ions  \item -3 Anions are very rare  \item +4 Cations are almost unheard of  \end{itemize}  \subsection{Ionic Bonding}  When a metal reacts with a non-metal, ions will be formed if the overall energy change for the reaction is favourable.