Correct Answer: Lithium and Magnesium
Subject: chemistry
Explanation: • <b>Key Fact</b> A diagonal relationship exists between certain elements in the second and third periods, such as Li & Mg. • <b>Supporting Detail</b> Lithium (Li) and Magnesium (Mg) exhibit similar sizes and electronegativity values. • <b>Related Concept</b> Other pairs include Beryllium (Be) & Aluminum (Al), and Boron (B) & Silicon (Si). • <b>Why wrong options are wrong</b> The other given options do not share similar charge-to-radius ratios. • <b>Exam Trick</b> Draw a diagonal line from Group 1, Period 2 downwards to the right (Li -> Mg). • <b>Additional Info</b> They behave similarly chemically because their ionic potential is almost equal.
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