Lithium shows similarities with magnesium in its chemical behaviour because :

similar size, greater electronegativity and lower polarising power

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similar size, same electronegativity, and lower polarising power

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similar size, same electronegativity and similar high polarising power

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none of the above

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Solution

The correct option is C similar size, same electronegativity and similar high polarising power
Lithium shows similarities with magnesium in its chemical behaviour because they have similar size and charge/size ratio. They have similar electronegativity.

This type of diagonal similarity is commonly referred to as diagonal relationship in the periodic table.

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