Give the reason why the two isotopes of magnesium have different mass numbers.

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Solution

$^{24} M g_{12}$ and $^{26} M g_{12}$ are two isotopes of $M g .$ Mass number of protons and number of neutrons present in the atom.
Since, isotopes differ by the number of newtrons, mass number of isotopes of $M g$ are different.
In $^{24} M g_{12}$ No. of protons $= 12$ .
No. of neutrons $= 12$
In $^{26} M g_{12}$ No. of protons $= 12$ .
No. of neutrons $= 14$

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_{12}^{24} M g

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