Question

physical property of alkali metal(class 11)

Answer 1

The alkali metals have following properties in common, they have low mekting and boiling points compared to most other metals. They are very soft and can be cut easily with a knife. They have low density (lithium, sodium and potassium will float on water.

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Answer 2

Physical properties of the alkali metals
The alkali metals show trends in physical properties down the group.

1..Melting point
The alkali metals have low melting and boiling points compared to most other metals. Apart from the other alkali metals, only three metals (indium, gallium and mercury) have lower melting points than lithium.

2..Boiling point
The boiling points of these alkali metals show a similar pattern to the melting points.

3..Density
The density of a substance is a measure of how much mass it has for its size. It is measured in grams/cubic centimetre. For example gold and lead are very dense metals - even a small lump of either of them can still feel heavy. The alkali metals have low densities compared to most other metals.

4..

Hardness
The alkali metals are very soft. Lithium is the hardest alkali metal and they become softer as you go down the group.