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Nuclear Equations

Akoranga 6 Te Whāinga Ako

Write the date and te whāinga ako in your books


Alpha Decay

Complete this cloze

In alpha emission, the decaying atom loses 2 protons and 2 neutrons.

This means that the atomic number of the decaying atom is ________ by ________ and the mass number is ________ by ________.


Pātai Tahi: Fill out this table for $\alpha$ decay


Whakatika Tahi


\begin{align*} & {}^{214}_{81}Tl \rightarrow {}^{210}_{79}Au + {}^{4}_{2}He \newline & {}^{214}_{81}Tl \rightarrow {}^{210}_{79}Au + {}^{4}_{2}\alpha \newline \end{align*}


Beta Decay

Complete this cloze

In a beta emission, a neutron turns into a proton and emits a high-speed electron.

This means that the atomic number of the decay atom is ________ by ________ and the mass number _____________.


Pātai Rua: $\beta$ Decay


Whakatika Rua


Pātai Toru: Write a nuclear equation


Whakatika Toru

\begin{align*} & {}^{218}_{84}Po \rightarrow {}^{218}_{85}At + {}^{0}_{-1}e \newline & {}^{218}_{84}Po \rightarrow {}^{218}_{85}At + {}^{0}_{-1}\beta \newline \end{align*}


Gamma Decay

Complete this cloze

In a gamma ($\gamma$) emission, the decaying atom only loses ________, which means it has the ________ number of protons and neutrons afterwards.


Pātai Whā: Gamma Decay


Whakatika Whā


Pātai Rimu: Write a nuclear equation


Whakatika Rimu

\begin{align*} & {}^{201}_{79}Au \rightarrow {}^{201}_{79}Au + \gamma \newline \end{align*}


Ngā Pātai: Write the following equations:

  1. An alpha decay of Polonium-218
  2. A beta decay of Hydrogen-3
  3. A gamma decay of Carbon-14
  4. An absorption of a neutron by Carbon-13

Ngā Whakatika 1-4

\begin{align*} & {}^{218}_{84}Po \rightarrow {}^{214}_{82}Pb + {}^{4}_{2}He \newline & {}^{3}_{1}H \rightarrow {}^{3}_{2}He + {}^{0}_{-1}\beta \newline & {}^{14}_{6}C \rightarrow {}^{4}_{6}C + \gamma \newline & {}^{13}_{6}C + {}^{1}_{0}n \rightarrow {}^{14}_{6}C \end{align*}


  1. A double alpha decay of Uranium-234
  2. A double alpha decay of Radon-222
  3. A double beta decay of Thorium-234
  4. A double beta decay of Bismuth-210

Ngā Whakatika 5-8

\begin{align*} & {}^{234}_{92}U \rightarrow {}^{226}_{88}Ra + 2{}^{4}_{2}He \newline & {}^{222}_{88}Ra \rightarrow {}^{216}_{84}Po + 2{}^{4}_{2}He \newline & {}^{234}_{90}Th \rightarrow {}^{234}_{92}U + 2{}^{0}_{-1}\beta \newline & {}^{210}_{83}Bi \rightarrow {}^{210}_{85}At + 2{}^{0}_{-1}\beta \end{align*}