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\section*{EL1}  \subsection{Simple Model of the Atom}  Atoms can be considered to consist of 3 sub-atomic particles  \begin{itemize}  \item Proton, Mr 1, Charge of +1  \item Neutron, Mr 1, Neutral  \item Electron, Mr $\frac{1}{2}$, Charge of -1  \item Most of the atom is empty space  \end{itemize}  \subsection{Nuclear Symbols}  \begin{itemize}  \item Atomic Number, Z  \begin{itemize}  \item Number of protons  \item Lower number  \item Equal to charge on Nucleus  \end{itemize}  \item Mass Number, A  \begin{itemize}  \item Number of protons and neutrons  \item Highest number  \end{itemize}  \end{itemize}  \subsection{Isotopes}  \begin{itemize}  \item Atoms of same element with different mass numbers  \item Different number of neutrons  \end{itemize}  \subsubsection{Relative Atomic Mass}  \begin{itemize}  \item Average of relative Isotopic Masses  \item Taking abundance into account  \item Mass Spectrometry used to find it  \end{itemize}  \subsection{Mass Spectrometry}  \begin{itemize}  \item Measures atomic/molecular mass of different particles, and relative abundances  \item Ionised to cations  \item Separated by mass to charge rations  \end{itemize}  \subsection{Nuclear Fusion}