8.5 Noble Gases (Cambridge (CIE) O Level Chemistry): Flashcards
Exam code: 5070
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What is a noble gas?
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What is a noble gas?
A noble gas is a Group 0 element that is monoatomic, colourless and chemically inert (unreactive) because it has a full outer shell of electrons.
Why are noble gases chemically inert?
Noble gases have a full outer shell of electrons, giving them an extremely stable electronic configuration. They do not need to gain, lose or share electrons, so they do not form bonds or react.
Complete the table with the electronic configurations of the Noble gases.
Noble gas
Electronic configuration
helium
neon
argon
Noble gas
Electronic configuration
helium
2
neon
2,8
argon
2,8,8
True or False?
Noble gases exist as diatomic molecules at room temperature.
False.
Noble gases are monoatomic: they exist as single atoms because their full outer shells make them so stable that they do not bond even with atoms of the same element.
What percentage of dry air is made up of noble gases?
Noble gases make up approximately 1% of dry air. They form the remainder after nitrogen (78%) and oxygen (21%).
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