Across short period the melting and boiling point increase upto __________________?
Correct answer: B. IVA group
- A. IIIA group
- B. IVA group
- C. VA group
- D. VIA group
Explanation
Across a short period, melting and boiling points generally rise as bonding becomes stronger, reaching a maximum at Group IVA because elements such as carbon and silicon form strong giant covalent structures. Beyond Group IVA, the structures become molecular or otherwise less strongly bonded, so the values fall. The likely mistake is choosing VA by extending the left-to-right increase without considering the change in structure after Group IVA.
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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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