What is the general trend of melting and boiling point of transition elements along the period?
Correct answer: C. Increases up to middle then decreases
- A. Increases from left to right
- B. Decreases from left to right
- C. Increases up to middle then decreases
- D. Decreases up to middle than increases
Explanation
Melting and boiling points of transition elements along a period are directly proportional to the number of unpaired electrons. As the unpaired electrons increase up to groups VB and VIB that pairing takes place and the number of unpaired electrons goes on decreasing until it becomes zero at group IIB. So, the melting and boiling points also increase in the middle of the series and then decrease to a minimum level at the end of the series.
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About Transition Elements
Transition elements are identified by their partially filled d subshells in atoms or common ions. The topic covers the electronic structure of d-block elements, including the filling order of 4s and 3d orbitals, variable oxidation states and the distinction between transition elements and elements with completely filled d subshells.
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