The set of elements that differ in mutual relationship from those of the other sets is :
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- Li - Na
- Be - Al
- B - Si
- Li - Mg
The Correct Option is A
Solution and Explanation
B (group 13, period 2) and Si (group 14, period 3) are diagonally related.
Li (group 1, period 2) and Mg (group 2, period 3) are diagonally related.
Li and Na are both in group 1 (one below the other), so their relationship is a group (vertical) relationship, different from the other three sets.
Answer: (1) Li - Na
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