A nucleus ${}_{11}^{24}{Na}$ emits a beta particle to change into magnesium(Mg). What are numbers 24 and 11.

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Solution

If an element is denoted by ${}_{Z}^{A}X$ then Z denotes atomic number, A denotes mass number.
In ${}_{11}^{24}{Na}$ 11 is the atomic number and 24 is the mass number.

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

What is the general name of ${}_{12}^{24}{Mg}$ with respect to ${}_{11}^{24}{Na}$

A nucleus ${}_{11}N a^{24}$ emits a $β$ -particle to change into magnesium $(Mg)$ .

_{11}^{24} N a

24

11

β

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