Which is the rarest Group 1 element?
francium
Do all group 1 elements react vigorously with water?
All the alkali metals react vigorously with cold water. This shows that the reactivity of the alkali metals increases as you go down Group 1.
What is the trend as we go down Group 1?
Explaining the trend 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.
What happens when group 1 elements react with oxygen?
The group 1 elements react with oxygen from the air to make metal oxides . At room temperature, oxygen reacts with the surface of the metal. This forms a white oxide, which covers the surface. The metal below the surface does not react.
Does gold react with oxygen?
Gold does not react with oxygen at any temperature and, up to 100 °C, is resistant to attack from ozone. Some free halogens react with gold.
Do Group 1 metals have low melting points?
Alkali Metals have lower melting and boiling Points All Group 1 elements have one electron in their outermost shell which is held very weakly by the nucleus. The increasing atomic radius means weaker forces between the atoms and so a lower melting and boiling point.
Why group 1 elements are soft and have low melting 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.
Why does boiling point increase down Group 1?
The figure above shows melting and boiling points of the Group 1 elements. The decrease in melting and boiling points reflects the decrease in the strength of each metallic bond. The atoms in a metal are held together by the attraction of the nuclei to electrons which are delocalized over the whole metal mass.
Do metals have low melting and boiling points?
Most non-metals have low melting points are not in the solid state at room temperature….Physical properties of metals and non-metals.
| Metals | Non-metals |
|---|---|
| High melting points | Low boiling points |
| Good conductors of electricity | Poor conductors of electricity |
| High density | Low density |
| Malleable | Brittle |
Which element has highest melting point?
Carbon