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2008-11-18 18:29:32
2008-11-18 18:29:32

the relationship between the melting points and boiling points is simply that the higher the melting point, the higher the boiling point. the metal has to melt before it can boil, so if it didn't melt, it won't boil. there fore, the higher the melting point, the higher the boiling point ill be.


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The relationship of the alkali metals is simple, as the atomic radius increases the inter molecular forces become weaker as there is less gravitational force acting on the electrons as they are further away from the nucleus (source of gravity), making it easier for them to react/come loose. This is why the melting and boiling points decrease.

Low melting and boiling point

All alkali metals are found to be very soft and they have low melting and boiling points. Alkali metals have low binding energy in the metal crystal lattice as these atoms have only one valence electron. This results in the formation of metallic bonds which are not very strong. Also, alkali metals melting and boiling points decrease down the group.

the melting point and the boiling point generally decrease as you go down the group

The melting point decreases and the atomic radius increases as you go down the group.

It's an inverse relationship. As you go down Group 1, the Alkali Metals, atomic radius increases and melting point decreases.

The melting and boiling point of the alkali metals are low indicating week metallic bonding due to the presence of only a single valence electron in them. Hence alkali metals are soft.

Group 1 belongs to Alkali metals.They have low melting and boiling point.

From The alkali metals show a decrease in melting points and boiling points due to the weaker metallic bonds between atoms as their size increase down the group.From AUS-e-TUTE: melting point decreases down the Group as the elements become less metallic in natureFrom As one goes down the Periodic Table, the metallic radius of alkali metals increases. The increase in radius results in much decreased attractive forces between atoms within the liquid metals, resulting in a decrease in heat of vaporization and boiling points [and melting points] because less heat is needed to separate atoms from the liquid [or solid] state within the larger alkali metals. See Web Links to the left for the original sources.

Mercury, all alkali metals (like Sodium) and alkaline-earth metals (like Calcium).

Alkali metals are very reactive, not dense or hard metals, monovalent, with low electronegativities, with low melting and boiling points, react violently with water, form strong bases, etc.

The melting point of alkali metals is low.

Alkali metals have relatively low melting points compared to the other metals. Their exact melting points depend on the element itself. But it would be useful to note that their melting points decreases down group I.

As you go down a column in the periodic table, the atomic radius increases, and melting point decreases for the alkali metals.

Th reactivity of alkali metals increases from the top of Group 1A to the bottom

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

because there is a higher number of atoms in the alkali metals meaning the ones lower in the periodic table are more prone to melting easily

There is no relation ship. They have the lowest ionization energies.

as the sterength of bonds in alkali metals decreases down the group its melting point decreases This is because metal atoms are held together by the electromagnetic attraction from the positive ions to the delocalised electronsthe metallic bond becomes weaker so that the metal can more easily melt and boil, thus lowering the melting and boiling points.The increased nuclear charge is not a relevant factor due to the screening effect

Mercury, it is already molten at room temperature. Alkali metals also have relatively low melting points compared to most metals, e.g. melting point of potassium is 64 degree Celsius. The melting points of alkali metals decreases down Group I.

The melting point of francium is not measured, only supposed by comparison with the melting points of the other alkali metals.

1. Alkali metals are soft and highly reactive. 2. They have low melting points and densities.

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