Lithium shows similarities with magnesium in its chemical behaviour because :
A
similar size, greater electronegativity and lower polarising power
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B
similar size, same electronegativity, and lower polarising power
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C
similar size, same electronegativity and similar high polarising power
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D
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.