C2 Group 0 Elements Flashcards
What are group 0 elements known as?
Noble gases
List the noble gases (6)
Helium Neon Argon Krypton Xenon Radon
How many electrons do noble gases have in their outer energy level?
8 giving them a full outer shell
apart from helium which has 2
What make noble gases stable?
Their outer shell is energetically stable (as it has 8 electrons), so they don’t give up or gain electrons to become more stable.
Noble gases are inert.
What does inert mean?
They don’t react with much at all.
Group 0 elements exist as monatomic gases. What is a monatomic gas?
Single atoms not bonded to each other.
Complete the sentence.
All elements in group 0 are ……………………… at room temperature.
Colourless gases
Complete the sentence.
As the noble gases are inert they’re ………….
Non flammable (they won’t set on fire)
What happens to the melting point and boiling point of group 0 elements as you move down the group?
They increase
Why do the melting and boiling point of noble gases increase as you go down the group?
This is due to an increase in the number of electrons in each atom leading to greater forces between the atoms which need to be overcome.
In the exam you may be given the melting point or boiling point and asked to estimate the value for another one.
You need to learn the pattern.
Neon is a gas at 25 degree C. Predict what state helium is at this temperature.
Helium must be a gas at 25 degree C
Helium has a lower boiling point than neon as it is further up the group
Radon and krypton have boiling points of -62 degree C and - 153 degree C respectively. Predict the boiling point of xenon.
Xenon should have a boiling point of -108 degree C
Xenon comes in between radon and krypton in the group so you can predict that it’s boiling point would be halfway between their boiling points.
(-153) + (-62) = -215
-215 / 2 =-107.5
Does xenon or neon have a higher boiling point? (1 mark)
Xenon has a higher boiling point than neon
Argon is very unreactive. Using your knowledge of its electronic structure, explain why. (2 marks)
Argon has a full outer shell (1 mark) so it’s electronically stable and does not readily lose or gain electrons (1 mark)
