Period 3 trends Watch

Habeeb H Patel
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Sulfur (S8) has a higher melting point then chlorine (Cl2) or phosphorous (P4) because of induced dipole dipole forces, so does it mean when sulfur has an instantaneous shift of electrons to one side of the molecule it creates a larger dipole and a greater attraction to neighbouring sulfur molecules, so needs a lot of energy to break up attraction. Is this correct
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purplepencil
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You are correct. Sulfur will form giant covalent structure just like carbon in diamond or graphite. (Notice that C and S are in the same group, both have 4 valence electrons. In S8 each S atom will form 4 bonds with other S atoms, thus, giant) Since it is a giant structure, there are more induced dipole dipole forces than there would be in Cl2 or P4. As a result, more energy is needed to overcome the many forces in S8. (Cl2 and P4 are simple covalent molecules so less energy is needed to melt them anyway).
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Habeeb H Patel
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(Original post by purplepencil)
You are correct. Sulfur will form giant covalent structure just like carbon in diamond or graphite. (Notice that C and S are in the same group, both have 4 valence electrons. In S8 each S atom will form 4 bonds with other S atoms, thus, giant) Since it is a giant structure, there are more induced dipole dipole forces than there would be in Cl2 or P4. As a result, more energy is needed to overcome the many forces in S8. (Cl2 and P4 are simple covalent molecules so less energy is needed to melt them anyway).


No sulfur is a simple covalent bond because it has indued dipole dipole forces between the molecules
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ChemistryWebsite
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(Original post by purplepencil)
You are correct. Sulfur will form giant covalent structure just like carbon in diamond or graphite. (Notice that C and S are in the same group, both have 4 valence electrons. In S8 each S atom will form 4 bonds with other S atoms, thus, giant) Since it is a giant structure, there are more induced dipole dipole forces than there would be in Cl2 or P4. As a result, more energy is needed to overcome the many forces in S8. (Cl2 and P4 are simple covalent molecules so less energy is needed to melt them anyway).
I think you may be confusing S with Si.
Sulfur will not form a macromolecular structure.
Sulfur has 6 outer shell electrons and is in Gp6 below oxygen.


You will also get induced dipole -dipole in P4 and Cl2, but note the molecule sizes and hence the amount of intermolecular forces.
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amaraub
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You essentially need to say :

Sulfur is larger so its a larger molecules
Therefore it has more electrons
So there are stronger VDW forces
So it needs more energy to break bonds between them

Make sure you specify what intermolecular force is present or you lose a mark
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