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Chemical properties of Li and Mg are similar because:

Correct answer: B. shows diagonal relationship.

  • A. these belong to same group.
  • B. shows diagonal relationship.
  • C. both has same ionization potential.
  • D. both has same electron affinity.

Explanation

The correct answer is that lithium (Li) and magnesium (Mg) show a diagonal relationship, which is why they exhibit similar chemical properties. This diagonal relationship is a unique phenomenon where elements that are diagonally positioned across adjacent periods in the periodic table exhibit similar properties. In the case of Li and Mg, despite being in different groups, they share metallic characteristics and tendencies to lose electrons, contributing to their similar chemical behavior. The other options are incorrect as they either inaccurately attribute the similarity to group membership, identical ionization potentials, or electron affinities, which are not the primary reasons for their chemical similarity.

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About Periodic Properties and Trends

Periodic properties arise from electron configuration and effective nuclear charge, producing trends in atomic and ionic radius, ionization energy, electron affinity, electronegativity, metallic character and reactivity. Comparisons run across periods and down groups, with attention to common exceptions. The topic also relates these trends to the behavior of s-block and p-block elements.

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