https://padlet.com/302528/3ir04fe7gcu7 en-us 2017-04-25 16:43:31 UTC 2017-04-26 16:37:03 UTC hello@padlet.com 302528 https://padlet.com/302528/3ir04fe7gcu7/wish/168170280 Helium gas is an unreactive, colourless, and odourless monoatomic gas. It is the 2nd most abundant element after hydrogen. ]]> 2017-04-25 16:55:47 UTC https://padlet.com/302528/3ir04fe7gcu7/wish/168170280 302528 https://padlet.com/302528/3ir04fe7gcu7/wish/168430706 2017-04-26 16:34:16 UTC https://padlet.com/302528/3ir04fe7gcu7/wish/168430706