Collage from Chemistry (Elemental research) Xudoyberdiyev Javohir 9 Green

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Collage from Chemistry (Elemental research) 
Xudoyberdiyev Javohir 9 Green 
Bibliography of resources 
https://www.google.com/search?q=discovery+of+helium&rlz=1C1JZAP_r
uUZ975UZ975&oq=&aqs=chrome.1.35i39i362l4.3207603j0j15&sourceid
=chrome&ie=UTF-8
https://www.lenntech.com/periodic/elements/he.htm
https://en.wikipedia.org/wiki/Helium
https://www.google.com/search?q=physical+properties+of+helium&rlz=1
C1JZAP_ruUZ975UZ975&oq=physical+properties+of+helium&aqs=chro
me..69i57j0i22i30l7.15324j0j15&sourceid=chrome&ie=UTF-8