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There is no "generally". For alkali metals (group 1) and alkali earths (group 2) they decrease. For groups 4 to 10 they rise, for group 11 it goes down from copper to silver and then up to gold.
Wiki User
∙ 7y ago
Wiki User
∙ 13y agoThe melting point decreases because:
- the element gets more reactive
- the atom gets bigger (more electrons added)
- density increases
- hardness decreases = weaker bonding
Wiki User
∙ 9y agoMelting points are the temperatures at which metals begin to melt. They decrease as the forces of attraction between atoms get weaker.
Wiki User
∙ 7y agoDown in the group the atomic radius is greater and as a consequence the metallic bond is weaker.
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Melting points of alkali metals?
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.
Why boiling point of noble gases increase down in the group?
The melting and boiling points increase down the group because of thevan der Waals forces. The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.
Which trend decreases for metals down a group?
Melting Point
What happens to the melting point of the alkali metals as the atom increase in size?
As we move down the group, the melting point decreases.
How do the boiling points of the noble gases change as you go down?
The boiling points of noble gases increases down a group.
What is the trend in melting points as you go down the group of halogens?
The melting point is greater.
Melting points of alkali metals?
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.
What is the melting point for Mg?
The melting point of magnesium is 650 degrees celcius. It has the lowest melting point among all the group II metals (alkaline earth metals), though the melting points generally decrease down the group - magnesium is an exception and has the lowest melting point among them.
Which trend decreases for metals down a group atomic radiusreactivity or melting point?
Melting points generally decrease as you go down a group for group I and group II metals. This does not apply to the transition metals. Reactivity of metals increases down a group due to a larger size and less effective charge between the nucleus and valence electrons. Atomic radius increases due to a higher principle number of electrons.
Why boiling point of noble gases increase down in the group?
The melting and boiling points increase down the group because of thevan der Waals forces. The size of the molecules increases down the group. This increase in size means an increase in the strength of the van der Waals forces.
Do most transition metals have higher or lower melting points than the representative elements?
Yes, transition metals have higher melting points. This is due to having very strong bonds. This means that a larger amount of energy is needed in order to break them down or bring them to the melting points.
Which trend decreases for metals down a group?
Melting Point
How are ionic and covalent compounds different in terms of melting and boiling point and electrical conductivity and hardness and brittleness?
Ionic compounds generally have higher melting and boiling points.
What happens to the melting point of the alkali metals as the atom increase in size?
As we move down the group, the melting point decreases.
What are two prperties of the halogens?
They have low melting and boiling points which increases down the group. They form diatomic molecules They form simple ions with -1 charge They react with hydrogen to form acidic compound
When the elements in group 1 are considered in order from top to bottom each successive element at standard pressure has?
a lower melting point and a lower boiling point since the effective nuclear charge decreases going down a group therefore the amount of force needed to repel the electrons from the protons is weaker.
How do the boiling points of the noble gases change as you go down?
The boiling points of noble gases increases down a group.
