Which one of the following pairs shown diagonal relationship in the periodic table ?
Correct answer: B. Lithium and magnesium
- A. Sodium and Lithium
- B. Lithium and magnesium
- C. Lithium and beryllium
- D. Boron and Beryllium
Explanation
Lithium and magnesium lie diagonally opposite each other in the periodic table and show similar properties, such as forming nitrides and carbonates that decompose on heating. This similarity results mainly from their comparable ionic charge density. Students may choose sodium and lithium, but these elements are in the same group, not in a diagonal relationship.
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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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