which one has higher M.P? Kr or Ne?

[navneetdh]

I dont understand which one will have higher m.p

In the destroyer they say Kr has stronger dispersion forces therefore higher m.p.

But I thought since Kr is much bigger the nucleus of 2 molecules will be further apart and therefore held more weakly vs. Ne so Ne. will have stronger interactions with other molecules in the container.

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[prsndwg]

I think its Kr since its bigger and heavier

 

[Shinpe]

I dont understand which one will have higher m.p

In the destroyer they say Kr has stronger dispersion forces therefore higher m.p.

But I thought since Kr is much bigger the nucleus of 2 molecules will be further apart and therefore held more weakly vs. Ne so Ne. will have stronger interactions with other molecules in the container.

MP is about INTERmolecular forces (london dispersion), not INTRAmolecular forces (bond strength)

 

[navneetdh]

I think its Kr since its bigger and heavier

yes its Kr.

But Bigger wouldn't mean weaker interactions with neighboring atoms?? since their nucleus will be farther apart so easier to pull them away?

 

[navneetdh]

MP is about INTERmolecular forces (london dispersion), not INTRAmolecular forces (bond strength)

so umm is it like since they are bigger they meet other atoms more frequently and therefore have more interactions therefore stronger dispersion forces???

 

[prsndwg]

so umm is it like since they are bigger they meet other atoms more frequently and therefore have more interactions therefore stronger dispersion forces???

good analogy

 

[Shinpe]

so umm is it like since they are bigger they meet other atoms more frequently and therefore have more interactions therefore stronger dispersion forces???

Bigger means their electron clouds are larger and more disperse, meaning they are more POLARIZABLE (did i spell that correctly? lol), which gives you larger london DISPERSION forces...

 

[navneetdh]

ok thanks guys!!! makes a lot more sense.

Thank you