Why does the boiling point of hydrides increases down the group?

Why does the boiling point of hydrides increases down the group?

The partial charges, induced by the higher electronegativity of oxygen, mean that the hydrogens and oxygens will be attracted to one another by coloumbic forces. This in turn will increase the energy needed to pull the molecules apart, thus an increase in the boiling point is observed.

Why do their boiling and melting points 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 melting point increase down a group?

This attraction is caused by the correlated motion of electrons. With increasing amount of electrons, there can be more correlated motion and hence there is a stronger interaction between the molecules and an increasing melting / boiling point when you go down in group 7.

Why does the melting point of Group 15 hydrides increase down the group?

With increase in the atomic radii, the size of hydrides also increases. With increase in the size, the extent of van der Waals forces also increase. With increase in van der Waals forces, the boiling point increases. Thus, when you move down the group 15, the boiling points of its hydrides will increase.

Why does boiling point decrease down group 6?

The 7A elements (Fluorine, Chlorine, Bromine, Iodine) make weakly polar hydrides, and correspondingly weaker Van der Waals forces and intermolecular attraction; therefore their boiling points are lower.

Why do the group 4a hydrides increase in boiling point with period number?

The graphs of boiling point versus period for the Group 4 hydrides and the noble gases all show the expected gradual rise in boiling point due to the greater number of electrons in the bigger molecule, facilitating a greater number of transient dipole – induced dipole interactions, therefore increasing the …

Why does melting and boiling point decrease down group?

The decrease in melting and boiling points reflects the decrease in the strength of each metallic bond. When any of the Group 1 metals is melted, the metallic bond is weakened enough for the atoms to move more freely, and is broken completely when the boiling point is reached.

Why does boiling point decrease down group 15?

Atomic radii increase in size down the group. Electron affinity (the ability of the atom to accept an electron) decreases down the group. Boiling point (amount of energy required to break bonds to change a liquid phase substance to a gas) increases down the group. Metallic character increases down the group.

Why does the 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.

Why does melting and boiling point increase down Group 7?

In group 7, the further down the group an element is, the higher its melting point and boiling point . This is because, going down group 7: the molecules become larger. more energy is needed to overcome these forces.