Metals and non-metals in the periodic table
3 marks · NormalExplain why the elements in Group 0 (the noble gases) are very unreactive. Your answer should refer to electronic structure.
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Noble gases have full outer shells of electrons, so they have no tendency to gain, lose or share electrons. This makes them chemically unreactive.
Also accept: Outer shell is stable, does not react
Common mistakes: Saying 'because they are gases'; Confusing full outer shell with having eight electrons only (not all do: helium)
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Marking points
M1 · 1 mark · Refers to full outer electron shell or stable electronic configuration
M1 · 1 mark · States no tendency to gain, lose or share electrons
A1 · 1 mark · Links full shell to lack of chemical reactivity/inertness
Worked solution
Group 0 elements (noble gases) have a full outer shell of electrons. Because their outer shell is full, they do not tend to gain, lose or share electrons. This makes them very stable and unreactive (inert).