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AQA GCSE chemistry
Topic 1-Atomic structure & the periodic table
Alkali metals
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Alkaline
metals hydroxide when they react with water creating an alkaline solution what properties do they have?
Low density
soft
can be cut with a
knife
very
reactive
Alkali
metals and metals also share some general properties such as
Good
conductors
of
heat
and electricity
shiny
Drawing a chemical reaction that
alkaline
metals lose their one outer electron and become a
positive
iron
Must have a
electrons
in the atom shell which makes them very
unreactive
As you go down the group one that atoms get
larger
and under the outer electrons are more shielded from the
nucleus
The
shielding
makes the outer electrons less attractive to to the
nucleus
This makes it easier to
lose
the
auto
electrons
Alkali metals got more
reactive
as you go
down
the group
Describe the trend in the physical properties of the halogens as you go down the group what happens to the following?
Relative size
increases
melting
and
boiling
points increases
states at room temperature goes from a
gas
to a
solid
colour gets
darker
Reactivity
The
iron wool experiment and all experiments done with halogens are done in a fume cupboard as halogens are toxic elements
in group 7 the further down the group an element is the higher its relative molecular mass
melting point
and
boiling point.
it becomes less reactive
Displacement reaction occurs when a more
reactive
element from its compound
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