Bigger molecules will have stronger London dispersion forces
Which halogen has highest boiling point?
From the lowest boiling and melting point to the highest, the group in order is fluorine, chlorine, bromine, iodine and astatine.
Which has a higher boiling point Br2 or I2?
Since I 2 has higher molecular weight, it has stronger London dispersion forces so it has a higher boiling point than Br 2 .
Does Cl2 or Br2 have a higher boiling point?
For example, bromine, Br2, has more electrons than chlorine, Cl2, sobromine will have stronger London dispersion forces than chlorine, resulting in a higher boiling point for bromine, 59 oC, compared to chlorine, –35 oC.”
Why does boiling point increase down group 15?
The elements included in group number 15 are nitrogen, phosphorus, arsenic, antimony and bismuth. While moving down the group the atomic size of the element increases because an extra shell is added as the number of periods increases . ... So the boiling point of Sb is greater than Bi.
Which halogen has the lowest boiling point?
The halogens have low melting points and low boiling points. This is a typical property of non-metals. Fluorine has the lowest melting and boiling points.
Why is I2 boiling point so high?
Iodine is a larger molecule, with more electrons, than chlorine. Therefore Iodine has stronger intermolecular forces than chlorine , which require more energy to break. This results in Iodine having a higher boiling point than chlorine.
Why does I2 have higher boiling point than Br2?
Iodine has a higher boiling point than bromine because it has a higher relative molecular mass and so more electrons than Br2 , so there are stronger van der Waals’ forces of attraction between the molecules. More energy is needed to break these and so iodine has a higher boiling point than bromine.
Is Br2 stronger than F2?
Differences in boiling points between molecules are due to varying strength of intermolecular forces. From the data given, we know Br2 must have the strongest intermolecular forces as it has the highest boiling point, followed by NH3 and then F2.
Why CL has higher boiling point than Br?
Since bromine has larger size than chlorine, it will have stronger intermolecular forces and so more heat energy is required to break the strong bonds . Thus, bromine has a higher boiling point than chlorine. ... Dispersion forces are displayed more strongly by larger and heavier atoms than smaller and light atoms.
Why is Cl2 stronger than Br2?
Br2 molecules are larger than Cl2 molecules, so more electrons are present in Br2 molecules. Therefore there are stronger van der waals forces between Br2 molecules than Cl2 molecules, so more energy is needed to melt Br2.
Why boiling point decreases down the group?
Both the melting and boiling points decrease down the group. ... The decrease in melting and boiling points reflects the decrease in the strength of each metallic bond . The atoms in a metal are held together by the attraction of the nuclei to electrons which are delocalized over the whole metal mass.
Why arsenic has very high melting point?
Melting point from nitrogen to arsenic increases & from arsenic it decreases upto bismuth because down the group as the size of the element increases the tendency of elements to form three covalent bonds increases (inert pair effect).
Why does boiling point increase down the group?
The melting and boiling points increase down the group because of the van der Waals forces . The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.
Why does group 7 have low boiling points?
The group 7 elements exist as diatomic molecules . ... The bond between the atoms in a molecule is very strong, but the forces of attraction between molecules are weak . This explains why group 7 elements have low boiling points.
