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ICSE Class 10 Physics 2014 Paper

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A nucleus 11Na24{}_{11}\mathrm{Na}^{24} emits a beta particle to change into Magnesium (Mg)(\mathrm{Mg})
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Question : 66 of 66
Marks: +1, -0
What is the general name of 1224Mg{}^{24}_{12}\mathrm{Mg} with respectto 1124Na{}^{24}_{11}\mathrm{Na} ?
Solution:  
They are isobars.
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