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Topic 4 ­ groups in the periodic table

Properties of groups:

Alkali metals are reactive, soft metals with low densities
Transition metals are unreactive and form coloured
Halogens are reactive non-metals that form coloured vapours
Noble gases are unreactive non-metals

Metallic bonding

Particles in a metal are held together…

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They have high melting points ­ mercury is liquid at room
Less reactive than alkali metals
They have high densities
Malleable and good conductors of heat and electricity

Group 1 metals - alkali

The group 1 metals show a trend which they increase in
reactivity as one goes down…

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Here the lithium fizzes slightly and becomes smaller until it
eventually disappears.
When sodium is added, it melts to form a ball that moves around
the surface. It fizzes rapidly and hydrogen may burn with an orange
flame before it disappears.
When potassium is added, it melts and floats. It…

Page 4

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A displacement reaction is when a reactive metal replaces a less
reactive one from a compound. Like chlorine will displace bromine
as it is more reactive:
Chlorine + sodium bromide sodium chloride + bromine
Cl (g) + 2NaBr (aq) 2NaCl (aq) + Br (aq)
Noble gases
They are non-metals

Page 5

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air. So they made an hypothesis about the composition of air. This
was tested and the noble gases were discovered.
The noble gases have a low boiling point. The boiling points
increase as you go down the group
Noble gases have low densities because they are gases and the




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