Li resembles Mg due to diagonal relationship which is attributed to :

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same value of electron affinity

penetration of sub-shells

nearly same atomic and ionic size

identical effective nuclear charge

answer is A.

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Detailed Solution

Due to its small size, lithium differs from other alkali metals but resembles with Mg as its size and other periodic properties are closer to Mg. Its resemblance with Mg is known as diagonal relationship.

The correct option is A.

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