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\subsubsection{First Ionisation Enthalpy}  If sufficient energy is given to an atom, an electron is lost and the atom is ionised to become a positive cation. The first ionisation enthalpy of an element is the energy needed to remove one electron from every atom in one mole of isolated gaseous atoms of the element.  \begin{equation*}  X(g) \Rightarrow X^+ + e^-  \end{equation*} \begin{itemize}  \item First ionisation removes most loosely held electron  \item Highest in noble gases as they are difficult to ionise and unreactive  \end{itemize}