Jshek
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this is confusing...it says explain why melting point of sulfur is higher than Phosphorous

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S is bigger than P so more VDW FORCES between molecules

how is S bigger than P as the atomic radius of S is smaller than P?

and i read that the more electron the greater the vdw forces. so argon has the highest electrons so shoukldent it have the highest boiling points in period 3.....

help
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Pigster
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(Original post by Jshek)
this is confusing...it says explain why melting point of sulfur is higher than Phosphorous

answer
S is bigger than P so more VDW FORCES between molecules

how is S bigger than P as the atomic radius of S is smaller than P?

and i read that the more electron the greater the vdw forces. so argon has the highest electrons so shoukldent it have the highest boiling points in period 3.....

help
Sulfur exists as a number of allotropes, the most common one is S8.

Likewise phosphorus, P4.

It isn't size of atoms that matters it is the number of electrons and the space over which they can wander.

S8 both has more e- than P4 and the molecule is larger (and hence has a larger surface area of contact between molecules).
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Jshek
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(Original post by Pigster)
Sulfur exists as a number of allotropes, the most common one is S8.

Likewise phosphorus, P4.

It isn't size of atoms that matters it is the number of electrons and the space over which they can wander.

S8 both has more e- than P4 and the molecule is larger (and hence has a larger surface area of contact between molecules).
so if it was P AND Cl
so does that mean P higher melting point because it is a larger atom than Cl so more vdw
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Jshek
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(Original post by Jshek)
so if it was P AND Cl
so does that mean P higher melting point because it is a larger atom than Cl so more vdw
so P4 has more electrons that cl
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Pigster
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(Original post by Jshek)
so if it was P AND Cl
so does that mean P higher melting point because it is a larger atom than Cl so more vdw
It isn't size of atoms that matters it is the number of electrons and the space over which they can wander.

P4 both has more e- than Cl2 and the molecule is larger (and hence has a larger surface area of contact between molecules).
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Jshek
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(Original post by Pigster)
It isn't size of atoms that matters it is the number of electrons and the space over which they can wander.

P4 both has more e- than Cl2 and the molecule is larger (and hence has a larger surface area of contact between molecules).
ok understood . but what about argon compared to Cl
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Jshek
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(Original post by theJoyfulGeek)
Van der Waals forces are a relatively weak interaction, especially compared to metallic bonding / covalent in giant structures.
does noble gas compare as well like argon
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Pigster
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(Original post by Jshek)
ok understood . but what about argon compared to Cl
It isn't size of atoms that matters it is the number of electrons and the space over which they can wander.

Cl2 both has more e- than Ar and the molecule is larger (and hence has a larger surface area of contact between molecules).
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