A property which gradually increases on moving down a group in the periodic table is
Correct answer: D. Atomic size.
- A. Ionization enthalpy
- B. Electronegativity
- C. Electron affinity
- D. Atomic size.
Explanation
The correct answer is Atomic size. As you move down a group in the periodic table, the number of electron shells increases, which results in a larger atomic radius. Although the nuclear charge also increases, the effect of additional electron shells outweighs this, leading to an overall increase in atomic size.Other options are incorrect because:Ionization enthalpy: This decreases down a group due to the increased distance of the outermost electrons from the nucleus.Electronegativity: This decreases down a group as the atoms become larger, making it harder to attract electrons.Electron affinity: This does not follow a clear trend down a group and can vary depending on specific group characteristics.
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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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