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Question
A nucleus `""_11^24Na` emits a beta particle to change into Magnesium (Mg).
- Write the symbolic equation for the process.
- What are numbers 24 and 11 called?
- What is the general name of `""_12^24Mg `with respect to `""_11^24Na`?
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Solution
(i) In beta emission, the mass number remains unchanged and the atomic number increases by 1.
\[{}^{24}{11}\mathrm{Na} \rightarrow {}^{24}{12}\mathrm{Mg} + {}^{\;\;0}_{-1}e\]
sodium Magnesium Beta particle
(ii) The number 24 is the mass number of the nucleus and 11 is the atomic number.
(iii) `""_11^24Na `and `""_12^24Mg ` are isobars, i.e., `""_12^24Mg ` is an isobar of `""_11^24Na ` as they have same mass number (protons + neutrons) but different atomic number (protons).
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