Short answerEasy1 mark
9(iii)(b)
(24, 11)Na emits a nuclear radiation which does not alter the mass number but is deflected by a magnetic field.
Write the equation for this radioactive decay.
Topic: Nuclear equation for beta decay
Question wording verified against source paper
Answer
Exam answer
²⁴₁₁Na → ²⁴₁₂Mg + ⁰₋₁β.
Explanation
In β⁻ decay, a neutron changes into a proton and an electron is emitted; the mass number remains 24 and the atomic number increases from 11 to 12.
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