30 Most important elements by Noemi Romero https://padlet.com/300965/ls2kw527like Made with a wish on a star en-us 2017-04-25 16:35:57 UTC 2023-05-31 07:37:51 UTC hello@padlet.com H-Hydrogen-Atomic 300965 https://padlet.com/300965/ls2kw527like/wish/168166699 Number 1

Hydrogen  is a chemical element with chemical symbol H and atomic number 1. 

]]> 2017-04-25 16:45:20 UTC https://padlet.com/300965/ls2kw527like/wish/168166699 HE-HElium- 300965 https://padlet.com/300965/ls2kw527like/wish/168439981 2017-04-26 17:01:35 UTC https://padlet.com/300965/ls2kw527like/wish/168439981