Melting points of VII-A group elements down the group:
Correct answer: B. Decrease
- A. Increase
- B. Decrease
- C. Remain constant
- D. Remain same
Explanation
As we move down a group in the VII-A group (halogens), the atomic size increases due to additional electron shells. This larger size weakens the interatomic forces between the atoms, leading to a decrease in melting points. The weakening bond strength makes it easier for the atoms to break free and enter the liquid state at lower temperatures.
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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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