Melting points of VII-A group elements down the group ____________________?
Correct answer: A. Increase
- A. Increase
- B. Decrease
- C. Remain constant
- D. No regular trend
Explanation
The melting points of halogens increase down Group VIIA because molecular size and polarizability increase, strengthening London dispersion forces between their diatomic molecules. The likely mistake is choosing decrease by applying the trend for atomic radius or electronegativity, which is not the trend for melting point here.
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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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