Assertion :Magnesium has two isotopes $_{12}^{24} M g$ and $_{12}^{26} M g$ . According to which isotopes of magnesium have different mass numbers. Reason: Different mass number of isotopes is due to the difference in neutrons no.

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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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As they have different no of neutrons so they have different atomic mass.

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Assertion :Magnesium has two isotopes 2412Mg and 2612Mg. According to which isotopes of magnesium have different mass numbers. Reason: Different mass number of isotopes is due to the difference in neutrons no.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for AssertionAs they have different no of neutrons so they have different atomic mass.

Assertion :Magnesium has two isotopes $_{12}^{24} M g$ and $_{12}^{26} M g$ . According to which isotopes of magnesium have different mass numbers. Reason: Different mass number of isotopes is due to the difference in neutrons no.

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
As they have different no of neutrons so they have different atomic mass.