Uploaded November 2023 | Updated September 2026, 18 minutes ago
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In this video, we look at group 0 elements, which are also called the noble gases. First we look at the electronic structure of group 0 elements and see how they all have a full outer energy level (electron shell). We then see how this makes the group 0 elements generally unreactive. Next we look at the trend in boiling points of the group 0 elements and see why they are all gases at room temperature.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Find your 9s with PLUS. Click the link to try for free freesciencelessons.co.uk/modules/gcse-chemistry-1-triple
Teachers, to get PLUS for your school, email schools@freesciencelessons.co.uk
In this video, we look at group 0 elements, which are also called the noble gases. First we look at the electronic structure of group 0 elements and see how they all have a full outer energy level (electron shell). We then see how this makes the group 0 elements generally unreactive. Next we look at the trend in boiling points of the group 0 elements and see why they are all gases at room temperature.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.







![A Level Biology Revision Factors Affecting Genetic Biodiversity
You can find all my A Level Biology videos fully indexed at https://www.freesciencelessons.co.uk/a-level-revision-videos/a-level-biology/
In this video, we look at the factors affecting genetic biodiversity. This includes factors that increase genetic biodiversity such as mutations and gene flow, as well as factors that reduce genetic biodiversity such as the bottleneck effect, the founder effect and genetic drift.
Image credits:
Alpacas
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Philippe Lavoie, Public domain, via Wikimedia Commons
Herd of cows
https://commons.wikimedia.org/wiki/File:Herd_of_cows_on_the_sea_bank geograph.org.uk 3665300.jpg
Herd of cows on the sea bank by Mat Fascione, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons
Wheat field
https://commons.wikimedia.org/wiki/File:Vehn%C3%A4pelto_6.jpg
kallerna, CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
Charles Darwin
https://commons.wikimedia.org/wiki/File:Charles_Darwin_seated_crop.jpg
Charles_Darwin_seated.jpg: Henry Maull (1829–1914) and John Fox (1832–1907) (Maull & Fox) [3]derivative work: Beao, Public domain, via Wikimedia Commons
Sumatran tiger
https://commons.wikimedia.org/wiki/File:Sumatran_Tiger_Berlin_Tierpark.jpg
Captain Herbert, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Manx loaghtan
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Chris Bramhall at English Wikipedia, Public domain, via Wikimedia Commons
Stem Cutting
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Kumar83, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Black robin
https://commons.wikimedia.org/wiki/File:Black_Robin_on_Rangatira_Island.jpg
frances schmechel, CC BY-SA 2.0 https://creativecommons.org/licenses/by-sa/2.0, via Wikimedia Commons
Wolf
https://commons.wikimedia.org/wiki/File:Front_view_of_a_resting_Canis_lupus_ssp.jpg
Gary Kramer, Public domain, via Wikimedia Commons
Isle Royale
https://commons.wikimedia.org/wiki/File:Isle_Royale Beach_Near_Mouth_of_Washington_Creek.JPG
Jhodkiewicz at the English Wikipedia, CC BY-SA 3.0 http://creativecommons.org/licenses/by-sa/3.0/, via Wikimedia Commons
Moose
https://commons.wikimedia.org/wiki/File:Alces_alces.jpg
bcameron54, CC BY-SA 3.0 https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons A Level Biology Revision Factors Affecting Genetic Biodiversity](https://i.ytimg.com/vi/IL7n3M2n7s4/mqdefault.jpg)


![GCSE Chemistry Revision Development of the Periodic Table
Find your 9s with PLUS. Click the link to try for free https://www.freesciencelessons.co.uk/modules/gcse-chemistry-1-triple/
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In this video, we look at the development of the periodic table. First we look at what is meant by groups in the periodic table and why the periodic table is called periodic. We then look at how the scientists Döbereiner and Newlands made early attempts to categorise elements and why these were not successful. You are not expected to learn the work of these scientists but you could be provided with information about them in the exam and asked questions on them. We then look at the scientist Dmitri Mendeleev. We see how he produced a successful periodic table by arranging the elements by atomic weight. We look at how he switched the order of elements when required and left gaps for undiscovered elements. We finish by looking at how the modern periodic table arranges the elements by atomic number and how this solves the problem of elements being in the wrong order.
This video is based on the AQA spec. This video may be appropriate for iGCSE / O Level Chemistry. Please consult your specification. The Amazon link above is an affiliate link. This provides a small commission which helps to support freesciencelessons. The cost remains the same to you. If you prefer not to use this, you can search Amazon for the Freesciencelessons workbooks.
Image credits:
Dobereiner https://commons.wikimedia.org/wiki/File:Johann_Wolfgang_D%C3%B6bereiner.jpg
By Carl August Schwerdgeburth, 1785-1878 (engraver), and Fritz Ries, 1826-1857 (painter) [Public domain], via Wikimedia Commons
Newlands https://commons.wikimedia.org/wiki/File:John_Alexander_Reina_Newlands.jpg
By The original uploader was DALIBRI at German Wikipedia. (Transferred from de.wikipedia to Commons.) [Public domain], via Wikimedia Commons
Mendeleev https://commons.wikimedia.org/wiki/File:Mendeleev_c1880.jpg
See page for author [Public domain], via Wikimedia Commons GCSE Chemistry Revision Development of the Periodic Table](https://i.ytimg.com/vi/IoldeyRWgz8/mqdefault.jpg)