The boiling points of halogens generally increase as you move down the group from fluorine to iodine. This is due to the increase in the size and relative atomic mass of the atoms, which leads to stronger van der Waals forces between the molecules.
The trend in melting point from lithium to caesium is that it increases. Lithium has the lowest melting point of the alkali metals, while caesium has the highest melting point. This trend is due to the increasing strength of metallic bonding as atomic size increases down the group.
Melting Point
The melting point of a compound is determined by the strength of intermolecular forces. Ethane has stronger London dispersion forces due to its larger size and greater surface area, leading to a higher melting point compared to methane which only has weak London dispersion forces.
The density increase down.
In Group 1 (alkali metals), the melting and boiling points decrease as you move down the group due to the increase in atomic size and metallic bonding. In Group 7 (halogens), the melting and boiling points increase as you move down the group due to the increase in atomic size and London dispersion forces.
The trend in melting points as you go down the group of halogens is that they generally increase. This is due to the increasing number of electrons and atomic size which results in stronger van der Waals forces between the atoms, leading to higher melting points.
The boiling points of halogens generally increase as you move down the group from fluorine to iodine. This is due to the increase in the size and relative atomic mass of the atoms, which leads to stronger van der Waals forces between the molecules.
The trend in melting point from lithium to caesium is that it increases. Lithium has the lowest melting point of the alkali metals, while caesium has the highest melting point. This trend is due to the increasing strength of metallic bonding as atomic size increases down the group.
Melting Point
The boiling point decrease from lithium to caesium.
The boiling point and melting point of ununtrium are not specifically known due to its highly unstable and short-lived nature. However, as a general trend, the melting and boiling points of superheavy elements like ununtrium would be expected to increase with the increase in atomic number.
Melting and boiling points are not as straightforward to predict based on periodic trends as properties like atomic size or ionization energy. They are influenced by various factors such as intermolecular forces, molecular weight, and molecular structure. While general trends can be observed within a group or period, there are often exceptions due to these complex interactions.
a lower melting point and a lower boiling point. This trend occurs because the atoms get larger and the metallic bonds weaken, making it easier for the atoms to overcome intermolecular forces and change state.
The melting point of a compound is determined by the strength of intermolecular forces. Ethane has stronger London dispersion forces due to its larger size and greater surface area, leading to a higher melting point compared to methane which only has weak London dispersion forces.
As atomic number increases, boiling point/K increases due to there being more electrons, which create a larger strength of negative charge around the nucleus of the atom. This affects the van der waals' forces (the forces of attraction between molecules or atoms), and they become stronger. With stronger forces, it requires more energy input to change the state of the element - resulting in a higher boiling/melting point. [:
The trend of boiling points across a period in the periodic table should decrease from metals to nonmetals. The trend becomes more complicated between metals, the boiling point of metals tends to increase across a period.