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Chemistry
Paper 1
Group 0
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The elements in
Group 0
of the Periodic Table are called the
noble gases
They are
unreactive
and do not easily form molecules because their atoms have a arrangement of
electrons
(
full outer electrons
)
Noble gases
are:
Non-metals
Monatomic
(exist as single atoms)
Colourless
and
non-flammable
gases at room temperature
noble gases
have 8
electrons
in their outer shell, except
helium
which has
2
Being chemically inert makes noble gases useful for many applications
The
noble gases
have very low
melting
and
boiling
points
Going down the
group
melting and boiling point increases because:
The atoms get larger as you move down the group and their relative atomic mass increases
This leads to an increase in
intermolecular forces
between atoms
Therefore more energy is needed to overcome these