Why does melting point of alkali metals increase down the group?

Why does melting point of alkali metals increase down the group?

You have to know that elements with high lattice energy has high melting and boilng point. And since lattice energy is inversely related with radius of atoms it increases down a group and hence the melting point increases.

Why do melting points of alkali metals decrease?

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. The decrease in melting and boiling points reflects the decrease in the strength of each metallic bond.

What is the trend pattern in melting point?

Different groups exhibit different trends in boiling and melting points. For Groups 1 and 2, the boiling and melting points decrease as you move down the group. For the transition metals, boiling and melting points mostly increase as you move down the group, but they decrease for the zinc family.

What is the pattern of reactivity in alkali metals?

The reactivity of group 1 elements increases as you go down the group because: the atoms become larger. the outer electron becomes further from the nucleus. the force of attraction between the nucleus and the outer electron decreases.

Why do alkali metals become softer down the group?

They get softer and more reactive as you move down the period from lithium to sodium to potassium. Going down the Group 1A elements from Li to K, the outermost electron is further away from the nucleus and the overall net force of attraction between the protons in the nucleus and the outermost electron decreases.

Do alkali metals tend to have high or low melting points?

The alkali metals: are soft (they can be cut with a knife) have relatively low melting points.

Why does Sulphur have a higher melting point than phosphorus?

Sulfur: sulfur consists of S8 rings of atoms. The molecules are bigger than phosphorus molecules, and so the van der Waals attractions will be stronger, leading to a higher melting and boiling point.

Why do the alkali metals get more reactive?

The reactivity of Group 1 elements increases as you go down the group because: the outer electron gets further from the nucleus as you go down the group. the attraction between the nucleus and outer electron gets weaker as you go down the group – so the electron is more easily lost.