A trend which is common to elements of both the group IA and group VIIA,on going from top to bottom
Correct answer: D. Ionization energy decreases
- A. Boiling point increases
- B. Electron affinity increases
- C. Oxidizing power increases
- D. Ionization energy decreases
Explanation
The correct answer is that ionization energy decreases as you move from top to bottom within both Group IA and Group VIIA. This is due to the addition of electron shells, which increases the distance between the outermost electrons and the nucleus, reducing the effective nuclear charge experienced by these electrons. Consequently, less energy is required to remove an electron. In contrast, boiling points and electron affinities do not show consistent trends across both groups, and oxidizing power is not relevant for Group IA.
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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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