Which is the most reactive in Group 1?
francium
Why does boiling point increase down Group 7?
The boiling and melting points increase as you go down the group. This is because the strength of the Van Der Waals forces (or induced dipole-dipole interactions) increases since the atoms have more electrons as you descend the group. – Electron Shielding increases and outweighs the nuclear attraction.
Which group has high melting point?
Tungsten (W). From metals, tungsten has the highest melting point in periodic table. It is located in d block. 3,422 0C is the melting point of tungsten.
Why does density increase down Group 7?
So as you go down the group 7A and element in the halogen family would have the same volume, the atomic mass increases. Density is mass divided by volume, so this causes the density to. The number of valence electrons increases due to the increase in energy levels as the elements progress down the group.
Does boiling point increase down Group 1?
The figure above shows melting and boiling points of the Group 1 elements. Both the melting and boiling points decrease down the group. 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 group 1 elements are soft and have low melting and boiling point?
Alkali Metals features the large atomic radii between neighbouring atoms of Group 1. Hence, the molecules show weaker attractive forces and are soft and have low melting points.
Which group 7 element is a liquid for the greatest temperature range?
bromine
What is the trend in boiling points in Group 7?
The melting points and boiling points of the halogens increase going down group 7. This is because, going down group 7: the molecules become larger. more energy is needed to overcome these forces.
Why does density increase down the group?
On moving down the group the atomic size as well as atomic mass both increase but increase in atomic mass predominates over increase in atomic size or atomic volume and therefore the ratio mass/volume i.e. density gradually increases down the groups.
Does density increase down the group?
Trends in Density The densities of the Group 1 elements increase down the group (except for a downward fluctuation at potassium). This trend is shown in the figure below: The metals in this series are relatively light—​lithium, sodium, and potassium are less dense than water (less than 1 g cm-3).
Which element in Group 1 has the highest density?
Francium
Why do Group 1 elements have low density?
At the ionization potential is more than twice that of lithium, for example, and H2 has a covalent, rather than metallic, bond. The gas is diatomic, with very little attraction between molecules, so its density is low. However, at sufficient pressure, it is believed that hydrogen would behave as a metal.