Which one of the following is not a periodic property ?
Correct answer: D. Coordination number of ions
- A. Melting point of elements
- B. Boiling point of elements
- C. Ionization energy of elements
- D. Coordination number of ions
Explanation
Melting point, boiling point, and ionization energy show systematic variation with atomic number and are therefore periodic properties. Coordination number depends mainly on crystal structure, ionic size, and surroundings rather than following a regular periodic trend, so students who choose a may confuse any measurable elemental property with a periodic property.
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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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