ICSE Class 10 Physics 2014 Paper

A nucleus ${}_{11}\mathrm{Na}^{24}$ emits a beta particle to change into Magnesium $(\mathrm{Mg})$

Question : 65 of 66

Marks: +1, -0

What are numbers 24 and 11 called?

Solution:

The number 24 is mass number and 11 is atomic number.

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