Im having trouble on the following problems Which substance has the highest boil

Question

Im having trouble on the following problems
Which substance has the highest boiling point? CH4, He, HF, Cl2
Draw Lewis for representations of all reasonable contributing structures to resonance hybrid of the nitrate ion
Which has a Lewis structure with the greatest number of unshared pairs on the central atom( show structures): NH3 IF3 SeCl2. ICl2

Im having trouble on the following problems
Which substance has the highest boiling point? CH4, He, HF, Cl2
Draw Lewis for representations of all reasonable contributing structures to resonance hybrid of the nitrate ion
Which has a Lewis structure with the greatest number of unshared pairs on the central atom( show structures): NH3 IF3 SeCl2. ICl2


Which substance has the highest boiling point? CH4, He, HF, Cl2
Draw Lewis for representations of all reasonable contributing structures to resonance hybrid of the nitrate ion
Which has a Lewis structure with the greatest number of unshared pairs on the central atom( show structures): NH3 IF3 SeCl2. ICl2


Draw Lewis for representations of all reasonable contributing structures to resonance hybrid of the nitrate ion
Which has a Lewis structure with the greatest number of unshared pairs on the central atom( show structures): NH3 IF3 SeCl2. ICl2

Explanation / Answer

HF has the highest boiling point.

Boiling occurs if the molecules got enough kinetic energy to overcome intermolecular (or interatomic) forces. HF is a very polar molecule and can exhibit hydrogen bonding.

Cl2 , He and CH4 Molecules are non polar and have relatively lower interparticle forces of attraction

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