Assertion :The average mass of one Mg atom is $24.305$ amu, which is not equal to the actual mass of one Mg atom. Reason: Three isotopes, $^{24} M g,^{25} M g$ and $^{26} M g$ of Mg can be found in nature.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The average mass of one Mg atom is $24.305$ amu, which is not the actual mass of one Mg atom.
The actual mass of one Mg atom is either 24 amu or 25 amu or 26 amu.
Three isotopes, $^{24} M g,^{25} M g$ and $^{26} M g$ of Mg are found in nature. they have different natural abundances. Their average mass comes to be 24.305 amu.
Thus, both Assertion and Reason are correct and Reason is the correct explanation for Assertion.

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