Magnesium has three naturally occurring isotopes with the following masses and natural abundances: $ \begin{matrix} \text{Isotope} & \text{Mass (amu)} & \text{Abundance( \\%)}\\ \text{Mg-24} & \text{23.9850} & \text{78.99}\\ \text{Mg-25} & \text{24.9858} & \text{10.00}\\ \text{Mg-26} & \text{25.9826} & \text{11.01}\\ \end{matrix} $ Sketch the mass spectrum of magnesium .