Assertion: Lithium resembles magnesium diagonally placed in next gr...

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Assertion: Lithium resembles magnesium diagonally placed in next group.
Reason : The size of \( \mathrm{Li}^{+} \)and \( \mathrm{Mg}^{2+} \) are different and their electropositive character is same.
1) If both assertion and reason are true and reason is the correct explanation of assertion.
2) If both assertion and reason are true but reason is not the correct explanation of assertion.
3) If assertion is true but reason is false.
4) If both assertion and reason are false.
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