I want to thank your team (Jeff) for finding a new writer when you were unable to reach my existing writer to revise my paper. I appreciate your professionalism and efforts. Thanks
The reason is that the attractive forces between the molecules of these increase from top to bottom of the Group..
The molecules of each substance attract each other through dispersion (London) intermolecular forces.
Whether a substance is a solid, liquid, or gas depends on the balance between the kinetic energies of the molecules and their intermolecular attractions.
Molecules at the same temp have the same average kinetic energy (##”KE” = 1/2mv^2##).
In fluorine, the electrons are tightly held to the nuclei. The electrons have little chance to wander to one side of the molecule, so the London dispersion forces are relatively weak.
At room temperature, the fluorine molecules have enough energy to escape these attractive forces. The attractions are not strong enough to make fluorine condense or solidify.
In bromine, the electrons are further from the nuclei, so it is easier to distort the electron cloud. The London dispersion forces are weak, but stronger than in fluorine.
The attractive forces are strong enough to hold the molecules close. But the molecules have enough kinetic energy to slide past each other, so bromine condenses to a liquid.
In iodine, the electrons are so far from the nuclei that the electron clouds can easily distort. The London dispersion forces are strong.
The molecules no longer have enough kinetic energy to escape the attractive forces. The attractions are strong enough to cause the iodine to solidify.
Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.
You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.Read more
Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.Read more
Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.Read more
Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.Read more
By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.Read more