CAIE A-Level Physics 11.1.5 Nuclide Notation

Practise reading and writing nuclide notation, identifying protons, neutrons and electrons, and comparing atoms, ions and nuclear changes.

Exam points

read and write nuclide notation A Z X, identifying A as nucleon number and Z as proton number
determine protons, neutrons, electrons or nuclear charge from A Z X notation
use nuclide notation to represent or compare atoms, ions and nuclear changes

[Maximum number: 2]

A stationary nucleus of magnesium-27, ${ }_{12}^{27} \mathrm{Mg}$ , decays by emitting a $\beta^{-}$ particle and $\gamma$ radiation. An incomplete equation to represent this decay is

{ }_{12}^{27} \mathrm{Mg} \rightarrow \mathrm{X}+\beta^{-}+\gamma .

State the nucleon number and the proton number of nucleus X .

\begin{gathered} \text { nucleon number }= \\ \text { proton number }= \end{gathered}

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11.1.5—The notation A Z X for the representation of nuclides question 1