What is the general trend of melting and boiling points of transition elements along the period?
Correct answer: C. Increases up to the middle then decreases
- A. Increases from left to right
- B. Decreases from left to right
- C. Increases up to the middle then decreases
- D. Decreases up to the middle and then increases
Explanation
The relationship between the melting and boiling points of transition elements within a period is directly influenced by the number of unpaired electrons. As the number of unpaired electrons increases up until groups VB and VIB, a phenomenon known as pairing occurs, causing the number of unpaired electrons to gradually decrease until reaching zero at group IIB. Consequently, the melting and boiling points exhibit a pattern of increasing towards the middle of the series and subsequently decreasing to a minimum level towards the end of the series.
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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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