Chemistry Assignment

Chemistry assignment.

When added to water, sodium fizzes more than lithium, and moves quickly across the surface of the water very quickly. Other elements below sodium will fizz even more than lithium or sodium because reactivity of alkali metals increases down the group.

Lithium – used in lubricants in batteries and glass industries.

Group 1 elements in terms of electronic structure (Alkali metals)

Alkali metals are all ionic compounds. They are metals in group 1, that have positive ions when the electron is lost. They also good electricity conducters because they have an extra electron in their outer shell. They’re also have high melting points, are hard but britle and are formed from one metal and one nonmetal .

Alkali metals become more reactive going down the group. This is because atoms of each element increase in their size also because the more shells, the more far electrons are away from nucleus and is shielded by more electrons.

Chlorine is a green gas that is used for sterilising water.

Bromine is an orange gas that is used to make plastics and pesticides.

Iodine is a solid that that creates grey solid and used for sterilising wounds.

They are created when halogens react with other substnces, then they become negative ions that are gaining an extra electron and this is how halides are created.

If a halogen is added to solution, of a compound containing a less reactive electron, it will react with the compound and form new one.

Halogens are non-metals, and they are all formed of covalent bonds. As they are all non-metals they have low melting points, non-metals and do not conduct electricity because they have shared electrons from other elements, brittle and crumbly when solid and poisonous and smelly.