Question

describe about the trends of MPT point Wise​

Answer 1

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Answer 2

hey,

1 If we compare two closely associated elements (one metal and other non metal) then MP of metal is less due to weak interactions..

2. In case of non-metals, the trend is determined by vanderwaal forces.. the bigger d size, higher the melting point..

3. In case of metals, MP is determined by metallic bonding which is inversely proportional to size.. the bigger d size, lesser d metallic bonding, lower the MP..

4. The no. of minimum similar atoms that constitute an independent stable molecule is also an important factor.. for instance Oxygen exists as a diatomic molecule and Sulphur exist as an octaatomic molecule.. thus, Sulphur has higher MP than oxygen due to this factor which contributes to larger vanderwaal force of interaction.. similar is the case of nitrogen and phosphorus..

5. Tin is bigger than lead (in terms' of radius), that's why, it has lower MP than lead (refer point 3)..

6. Gallium forms dimer resulting in its weak association with other gallium atoms.. and arsenic has a big array/network structure.. that's why gallium has low melting point while arsenic has the highest MP in its group..!

I think all these reasons combined together are sufficient to analyse the trend of melting point in P-Block..