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IGCSE Chemistry: Complete Revision Bank

Unit 8: The Periodic Table

8.5 Noble Gases

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23. Describe the reactivity and molecular state of Group VIII noble gases.
They are completely unreactive (inert) and exist exclusively as isolated monatomic gases.
24. Explain why noble gases are unreactive by referring to their electronic configuration.
They are chemically inert because they already possess a full outer shell of valence electrons (a stable octet, or duplet for Helium), meaning they have no energetic tendency to gain, lose, or share electrons.