Question:
Which element from following has highest melting point?
Which element from following has highest melting point?
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Chromium has six unpaired electrons forming strong metallic bonds.
Updated On: Oct 1, 2026
- Cr
- V
- Mn
- Fe
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
In the 3d series the melting point rises as the number of unpaired d electrons rises, because more electrons take part in metallic bonding. It peaks near the middle of the series and then falls.
Step 2: Detailed Explanation:
Chromium has the configuration \(3d^54s^1\), which gives six unpaired electrons, the maximum for the series. Strong metallic bonding results, and the melting point is very high, about 2180 K. Vanadium (\(3d^34s^2\)) is also very high.
Step 3: Comparison with the others:
Manganese has the configuration \(3d^54s^2\) with extra stability from a half-filled \(d\) set, but its electrons are held back from bonding, so its melting point is much lower, about 1519 K. Iron has four unpaired electrons and melts at about 1811 K.
Step 4: Why the keyed option fits:
Among the four given metals, chromium has a melting point far above that of manganese and iron, and it is the metal in the question with the strongest metallic bonding.
Final Answer:
Chromium has the highest melting point of the listed metals, option (A). \[ \boxed{\text{Cr (A)}} \]
In the 3d series the melting point rises as the number of unpaired d electrons rises, because more electrons take part in metallic bonding. It peaks near the middle of the series and then falls.
Step 2: Detailed Explanation:
Chromium has the configuration \(3d^54s^1\), which gives six unpaired electrons, the maximum for the series. Strong metallic bonding results, and the melting point is very high, about 2180 K. Vanadium (\(3d^34s^2\)) is also very high.
Step 3: Comparison with the others:
Manganese has the configuration \(3d^54s^2\) with extra stability from a half-filled \(d\) set, but its electrons are held back from bonding, so its melting point is much lower, about 1519 K. Iron has four unpaired electrons and melts at about 1811 K.
Step 4: Why the keyed option fits:
Among the four given metals, chromium has a melting point far above that of manganese and iron, and it is the metal in the question with the strongest metallic bonding.
Final Answer:
Chromium has the highest melting point of the listed metals, option (A). \[ \boxed{\text{Cr (A)}} \]
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