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s-Block Elements: Lithium anomaly MCQ

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Lithium anomalyEasyQuestion 880002

Question

Lithium resembles magnesium (diagonal relationship) because both:
  1. A
    Have similar charge-to-size ratio (charge density)
    Correct
  2. B
    Have same electronic configuration
  3. C
    Are in the same group
  4. D
    Form the same hydrides

Correct answer

Have similar charge-to-size ratio (charge density)

Explanation

Li⁺ and Mg²⁺ have similar ionic radii and charge densities → similar polarising power → form similar types of compounds. Both form covalent-character organometallic compounds, both carbonates decompose on heating, etc.

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