Question

Phosphorus melts at 44 0 C but lead melts at 325 0 C. Account for this difference in

melting points.​

Answer 1

Answer:

melting point

Explanation:

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Answer 2

The reason behind this difference in melting points, is as follows -

• The melting point of phosphorus is significantly low (44°C approx.) because the weak Van Der Waals force exists in the phosphorus as the intermolecular attraction force. This weak force is very easy to overpower by the application of small amount of heat energy. Thus the melting point of the phosphorus is low.
• On the other hand, the size of the atom of lead is much bigger than of the phosphorus. The Van Der Waals force increases with the size of the atomic radius. Thus the lead has the same but greater amount of Van Der Waals force and higher melting point, than the phosphorus.
• So, greater or lower amounts of Van Der Waals force is the reason behind this difference of melting points.