Q14.91 - Chemistry: Molecular Nature Of Matter And Change

Question

Question: As you move down Group 5A (15), the melting points of the elements increases and then decreases. Explain

Step-by-Step Solution

Answer

Answer

Melting point increased up to arsenic due to an increase in wander wall’s force and decreases till bismuth due to the inert pair effect.

Step 1: Group 15 elements

Group 15 elements belonging to the nitrogen family. They include nitrogen, phosphorus, arsenic, antimony, bismuth, and moscovium.

The atomic numbers of the group 15 elements are as follows;

Nitrogen (N) = 7

Phosphorus (P) = 15

Arsenic (As) = 33

Antimony (Sb) = 51

Moscovium (Mc) = 83

Step 2: Melting point for group 15 elements

For group 15 elements as we move down the group, the melting point first increases and then decreases.