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Class 6, 7 _ Elements and Compounds

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Some elements
https://www.youtube.com/watch?v=0rJmILZ8Psc&t=45s

https://www.youtube.com/watch?v=G9rH20lOE1c

Elements
https://www.youtube.com/watch?v=43uLaGo3Cxc&list=PL2gIzhGnfS9KLuN4kTDK0RSD9iAhviDwR&index=2

Pouring mercury in nitrogen
https://www.youtube.com/watch?v=5I4rxfnCtxY

Elements:
https://www.youtube.com/watch?v=6rdmpx39PRk&list=PL7A1F4CF36C085DE1

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